diff --git a/cmake/support_kokkos.cmake b/cmake/support_kokkos.cmake
index e37daa6a20..59c75c4ed6 100644
--- a/cmake/support_kokkos.cmake
+++ b/cmake/support_kokkos.cmake
@@ -13,8 +13,8 @@ set(KOKKOS_VERSION 4.0.01)
 # 3. Not installed, so fall back to building from source.
 macro(FindKokkos target_name)
     find_package(Kokkos
-    HINTS   ${CMAKE_SOURCE_DIR}/kokkos
-            ${CMAKE_SOURCE_DIR}/Kokkos
+    HINTS   ${pennylane_lightning_SOURCE_DIR}/kokkos
+            ${pennylane_lightning_SOURCE_DIR}/Kokkos
             ${Kokkos_Core_DIR}
             /usr
             /usr/local
@@ -30,7 +30,7 @@ macro(FindKokkos target_name)
 
         find_library(Kokkos_core_lib
             NAME kokkoscore.a libkokkoscore.a kokkoscore.so libkokkoscore.so
-            HINTS   ${CMAKE_SOURCE_DIR}/Kokkos/lib
+            HINTS   ${pennylane_lightning_SOURCE_DIR}/Kokkos/lib
                     ${Kokkos_Core_DIR}/lib
                     ${Kokkos_Core_DIR}/lib64
                     /usr/lib
diff --git a/cmake/support_simulators.cmake b/cmake/support_simulators.cmake
index 002dc61299..1fc3a2752b 100644
--- a/cmake/support_simulators.cmake
+++ b/cmake/support_simulators.cmake
@@ -9,7 +9,7 @@ include_guard()
 # All simulators have their own directory in "simulators"
 # This macro will extract this list of directories.
 MACRO(FIND_SIMULATORS_LIST RESULT)
-    set(SIMULATORS_DIR ${CMAKE_SOURCE_DIR}/pennylane_lightning/core/src/simulators)
+    set(SIMULATORS_DIR ${pennylane_lightning_SOURCE_DIR}/pennylane_lightning/core/src/simulators)
     FILE(GLOB FULL_LIST RELATIVE ${SIMULATORS_DIR} ${SIMULATORS_DIR}/*)
     SET(${RESULT} "")
     FOREACH(ITEM ${FULL_LIST})
diff --git a/pennylane_lightning/core/src/CMakeLists.txt b/pennylane_lightning/core/src/CMakeLists.txt
index 9f20a182f0..0423cf6c7d 100644
--- a/pennylane_lightning/core/src/CMakeLists.txt
+++ b/pennylane_lightning/core/src/CMakeLists.txt
@@ -19,7 +19,7 @@ endforeach()
 
 if (BUILD_TESTS)
     # Include macros supporting tests.
-    include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+    include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
     FetchAndIncludeCatch()
 
     include(CTest)
diff --git a/pennylane_lightning/core/src/algorithms/tests/CMakeLists.txt b/pennylane_lightning/core/src/algorithms/tests/CMakeLists.txt
index 8ec128d61b..1586aa865e 100644
--- a/pennylane_lightning/core/src/algorithms/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/algorithms/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/measurements/tests/CMakeLists.txt b/pennylane_lightning/core/src/measurements/tests/CMakeLists.txt
index 454807b107..2ceb0fd05d 100644
--- a/pennylane_lightning/core/src/measurements/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/measurements/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/observables/tests/CMakeLists.txt b/pennylane_lightning/core/src/observables/tests/CMakeLists.txt
index c46795a156..4aceed37f7 100644
--- a/pennylane_lightning/core/src/observables/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/observables/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/CMakeLists.txt b/pennylane_lightning/core/src/simulators/CMakeLists.txt
index 70e57de8d1..84ecdf3b99 100644
--- a/pennylane_lightning/core/src/simulators/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/CMakeLists.txt
@@ -7,7 +7,7 @@ add_subdirectory(base)
 ###############################################################################
 # Determine simulator and include its directory
 ###############################################################################
-include("${CMAKE_SOURCE_DIR}/cmake/support_simulators.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_simulators.cmake")
 FIND_AND_ADD_SIMULATOR()
 
 if (BUILD_TESTS)
diff --git a/pennylane_lightning/core/src/simulators/base/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/base/tests/CMakeLists.txt
index e982dac079..19e7845b5a 100644
--- a/pennylane_lightning/core/src/simulators/base/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/base/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_kokkos/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_kokkos/CMakeLists.txt
index 8d91d29aa7..aa11400553 100644
--- a/pennylane_lightning/core/src/simulators/lightning_kokkos/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_kokkos/CMakeLists.txt
@@ -37,7 +37,7 @@ option(PLKOKKOS_ENABLE_SANITIZER "Enable address sanitizer" OFF)
 option(PLKOKKOS_ENABLE_WARNINGS "Enable warnings" ON)
 
 # Include macro and functions supporting Kokkos libraries.
-include("${CMAKE_SOURCE_DIR}/cmake/support_kokkos.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_kokkos.cmake")
 FindKokkos(lightning_external_libs)
 
 if(PLKOKKOS_ENABLE_SANITIZER)
diff --git a/pennylane_lightning/core/src/simulators/lightning_kokkos/algorithms/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_kokkos/algorithms/tests/CMakeLists.txt
index 253696ca3a..ada10fab91 100644
--- a/pennylane_lightning/core/src/simulators/lightning_kokkos/algorithms/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_kokkos/algorithms/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_kokkos/gates/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_kokkos/gates/tests/CMakeLists.txt
index 5d2f7b2c89..e8bed25a69 100644
--- a/pennylane_lightning/core/src/simulators/lightning_kokkos/gates/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_kokkos/gates/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_kokkos/measurements/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_kokkos/measurements/tests/CMakeLists.txt
index 17f331c2af..853419669f 100644
--- a/pennylane_lightning/core/src/simulators/lightning_kokkos/measurements/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_kokkos/measurements/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_kokkos/observables/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_kokkos/observables/tests/CMakeLists.txt
index 044fab580b..57669f5030 100644
--- a/pennylane_lightning/core/src/simulators/lightning_kokkos/observables/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_kokkos/observables/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_kokkos/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_kokkos/tests/CMakeLists.txt
index fd8912ed31..1523600aa0 100644
--- a/pennylane_lightning/core/src/simulators/lightning_kokkos/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_kokkos/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_kokkos/utils/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_kokkos/utils/tests/CMakeLists.txt
index 8d1b3ec1f0..8cafa7c717 100644
--- a/pennylane_lightning/core/src/simulators/lightning_kokkos/utils/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_kokkos/utils/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_qubit/algorithms/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_qubit/algorithms/tests/CMakeLists.txt
index 732351e87c..876341e331 100644
--- a/pennylane_lightning/core/src/simulators/lightning_qubit/algorithms/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_qubit/algorithms/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_qubit/gates/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_qubit/gates/tests/CMakeLists.txt
index 67f80c4e3d..b9459c416e 100644
--- a/pennylane_lightning/core/src/simulators/lightning_qubit/gates/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_qubit/gates/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_qubit/measurements/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_qubit/measurements/tests/CMakeLists.txt
index f0a1dc1310..1ea6861b8a 100644
--- a/pennylane_lightning/core/src/simulators/lightning_qubit/measurements/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_qubit/measurements/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_qubit/observables/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_qubit/observables/tests/CMakeLists.txt
index c34e7a6558..967aaedd24 100644
--- a/pennylane_lightning/core/src/simulators/lightning_qubit/observables/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_qubit/observables/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_qubit/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_qubit/tests/CMakeLists.txt
index d0c0ea21eb..b7a2af2ebc 100644
--- a/pennylane_lightning/core/src/simulators/lightning_qubit/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_qubit/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/simulators/lightning_qubit/utils/tests/CMakeLists.txt b/pennylane_lightning/core/src/simulators/lightning_qubit/utils/tests/CMakeLists.txt
index 973649c216..c7be747810 100644
--- a/pennylane_lightning/core/src/simulators/lightning_qubit/utils/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/simulators/lightning_qubit/utils/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################
diff --git a/pennylane_lightning/core/src/utils/tests/CMakeLists.txt b/pennylane_lightning/core/src/utils/tests/CMakeLists.txt
index 1925f53181..2d194b4090 100644
--- a/pennylane_lightning/core/src/utils/tests/CMakeLists.txt
+++ b/pennylane_lightning/core/src/utils/tests/CMakeLists.txt
@@ -7,7 +7,7 @@ if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE Debug)
 endif()
 
-include("${CMAKE_SOURCE_DIR}/cmake/support_tests.cmake")
+include("${pennylane_lightning_SOURCE_DIR}/cmake/support_tests.cmake")
 FetchAndIncludeCatch()
 
 ################################################################################