diff --git a/.github/workflows/c-cpp.yml b/.github/workflows/c-cpp.yml
index 88df687bd6..8eede28705 100644
--- a/.github/workflows/c-cpp.yml
+++ b/.github/workflows/c-cpp.yml
@@ -38,7 +38,7 @@ jobs:
   CPU_MAC:
     runs-on: macos-latest
     env:
-      FC: gfortran-11
+      FC: gfortran-14 # see #971
     strategy:
       matrix:
         folder: [ epochX/cudacpp/ee_mumu.mad/SubProcesses/P1_epem_mupmum, epochX/cudacpp/gg_ttgg.mad/SubProcesses/P1_gg_ttxgg ]
diff --git a/epochX/cudacpp/CODEGEN/PLUGIN/CUDACPP_SA_OUTPUT/madgraph/iolibs/template_files/gpu/cudacpp.mk b/epochX/cudacpp/CODEGEN/PLUGIN/CUDACPP_SA_OUTPUT/madgraph/iolibs/template_files/gpu/cudacpp.mk
index a052631aa9..78512a5eeb 100644
--- a/epochX/cudacpp/CODEGEN/PLUGIN/CUDACPP_SA_OUTPUT/madgraph/iolibs/template_files/gpu/cudacpp.mk
+++ b/epochX/cudacpp/CODEGEN/PLUGIN/CUDACPP_SA_OUTPUT/madgraph/iolibs/template_files/gpu/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %%/bin/nvcc,%%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %%/bin/hipcc,%%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/ee_mumu.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/ee_mumu.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/ee_mumu.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/ee_mumu.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/ee_mumu.sa/SubProcesses/cudacpp.mk b/epochX/cudacpp/ee_mumu.sa/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/ee_mumu.sa/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/ee_mumu.sa/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/gg_tt.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/gg_tt.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/gg_tt.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/gg_tt.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/gg_tt.sa/SubProcesses/cudacpp.mk b/epochX/cudacpp/gg_tt.sa/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/gg_tt.sa/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/gg_tt.sa/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/gg_tt01g.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/gg_tt01g.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/gg_tt01g.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/gg_tt01g.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/gg_ttg.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/gg_ttg.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/gg_ttg.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/gg_ttg.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/gg_ttg.sa/SubProcesses/cudacpp.mk b/epochX/cudacpp/gg_ttg.sa/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/gg_ttg.sa/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/gg_ttg.sa/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/gg_ttgg.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/gg_ttgg.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/gg_ttgg.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/gg_ttgg.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/gg_ttgg.sa/SubProcesses/cudacpp.mk b/epochX/cudacpp/gg_ttgg.sa/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/gg_ttgg.sa/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/gg_ttgg.sa/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/gg_ttggg.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/gg_ttggg.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/gg_ttggg.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/gg_ttggg.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/gg_ttggg.sa/SubProcesses/cudacpp.mk b/epochX/cudacpp/gg_ttggg.sa/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/gg_ttggg.sa/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/gg_ttggg.sa/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/gq_ttq.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/gq_ttq.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/gq_ttq.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/gq_ttq.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/gq_ttq.sa/SubProcesses/cudacpp.mk b/epochX/cudacpp/gq_ttq.sa/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/gq_ttq.sa/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/gq_ttq.sa/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/heft_gg_bb.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/heft_gg_bb.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/heft_gg_bb.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/heft_gg_bb.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/heft_gg_bb.sa/SubProcesses/cudacpp.mk b/epochX/cudacpp/heft_gg_bb.sa/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/heft_gg_bb.sa/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/heft_gg_bb.sa/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/pp_tt012j.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/pp_tt012j.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/pp_tt012j.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/pp_tt012j.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/smeft_gg_tttt.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/smeft_gg_tttt.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/smeft_gg_tttt.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/smeft_gg_tttt.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/smeft_gg_tttt.sa/SubProcesses/cudacpp.mk b/epochX/cudacpp/smeft_gg_tttt.sa/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/smeft_gg_tttt.sa/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/smeft_gg_tttt.sa/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/susy_gg_t1t1.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/susy_gg_t1t1.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/susy_gg_t1t1.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/susy_gg_t1t1.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/susy_gg_t1t1.sa/SubProcesses/cudacpp.mk b/epochX/cudacpp/susy_gg_t1t1.sa/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/susy_gg_t1t1.sa/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/susy_gg_t1t1.sa/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/susy_gg_tt.mad/SubProcesses/cudacpp.mk b/epochX/cudacpp/susy_gg_tt.mad/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/susy_gg_tt.mad/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/susy_gg_tt.mad/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand
diff --git a/epochX/cudacpp/susy_gg_tt.sa/SubProcesses/cudacpp.mk b/epochX/cudacpp/susy_gg_tt.sa/SubProcesses/cudacpp.mk
index 359f16c029..9cff5e1a60 100644
--- a/epochX/cudacpp/susy_gg_tt.sa/SubProcesses/cudacpp.mk
+++ b/epochX/cudacpp/susy_gg_tt.sa/SubProcesses/cudacpp.mk
@@ -116,15 +116,31 @@ override CUDA_HOME = $(patsubst %/bin/nvcc,%,$(shell which nvcc 2>/dev/null))
 # Set HIP_HOME from the path to hipcc, if it exists
 override HIP_HOME = $(patsubst %/bin/hipcc,%,$(shell which hipcc 2>/dev/null))
 
-# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists
-# (FIXME? Is there any equivalent of NVTX FOR HIP? What should be configured if both CUDA and HIP are installed?)
-ifneq ($(CUDA_HOME),)
-  USE_NVTX ?=-DUSE_NVTX
-  CUDA_INC = -I$(CUDA_HOME)/include/
+# Configure CUDA_INC (for CURAND and NVTX) and NVTX if a CUDA installation exists (see #965)
+ifeq ($(CUDA_HOME),)
+  # CUDA_HOME is empty (nvcc not found)
+  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/),)
+  # CUDA_HOME is defined (nvcc was found) but $(CUDA_HOME)/include/ does not exist?
+  override CUDA_INC=
 else
+  CUDA_INC = -I$(CUDA_HOME)/include/
+endif
+###$(info CUDA_INC=$(CUDA_INC))
+
+# Configure NVTX if a CUDA include directory exists and NVTX headers exist (see #965)
+ifeq ($(CUDA_INC),)
+  # $(CUDA_HOME)/include/ does not exist
   override USE_NVTX=
-  override CUDA_INC=
+else ifeq ($(wildcard $(CUDA_HOME)/include/nvtx3/nvToolsExt.h),)
+  # $(CUDA_HOME)/include/ exists but NVTX headers do not exist?
+  override USE_NVTX=
+else
+  # $(CUDA_HOME)/include/nvtx.h exists: use NVTX
+  # (NB: the option to disable NVTX if 'USE_NVTX=' is defined has been removed)
+  override USE_NVTX=-DUSE_NVTX
 endif
+###$(info USE_NVTX=$(USE_NVTX))
 
 # NB: NEW LOGIC FOR ENABLING AND DISABLING CUDA OR HIP BUILDS (AV Feb-Mar 2024)
 # - In the old implementation, by default the C++ targets for one specific AVX were always built together with either CUDA or HIP.
@@ -424,13 +440,18 @@ endif
 # (NB: allow HASCURAND=hasCurand even if $(GPUCC) does not point to nvcc: assume CUDA_HOME was defined correctly...)
 ifeq ($(HASCURAND),)
   ifeq ($(GPUCC),) # CPU-only build
-    ifneq ($(CUDA_HOME),)
+    ifeq ($(CUDA_INC),)
+      # $(CUDA_HOME)/include/ does not exist (see #965)
+      override HASCURAND = hasNoCurand
+    else ifeq ($(wildcard $(CUDA_HOME)/include/curand.h),)
+      # $(CUDA_HOME)/include/ exists but CURAND headers do not exist? (see #965)
+      override HASCURAND = hasNoCurand
+    else
       # By default, assume that curand is installed if a CUDA installation exists
       override HASCURAND = hasCurand
-    else
-      override HASCURAND = hasNoCurand
     endif
   else ifeq ($(findstring nvcc,$(GPUCC)),nvcc) # Nvidia GPU build
+    # By default, assume that curand is installed if a CUDA build is requested
     override HASCURAND = hasCurand
   else # non-Nvidia GPU build
     override HASCURAND = hasNoCurand