diff --git a/util/cmk b/util/cmk
index 491a85f..364d114 100755
--- a/util/cmk
+++ b/util/cmk
@@ -46,7 +46,7 @@ CMAKE_PREFIX_PATH = None
 #CMAKE_PREFIX_PATH = "/home/cary/builds/releases/openexr-3.2.0-Release/install/lib/cmake"
 #CMAKE_PREFIX_PATH = "/home/cary/builds/src/cary-ilm/Imath/fix_export_setting-Release/install"
 #CMAKE_PREFIX_PATH = "/home/cary/builds/src/cary-ilm/Imath/main-Release/install"
-#CMAKE_PREFIX_PATH = "/home/cary/builds/src/cary-ilm/Imath/main-Release/install:/home/cary/builds/src/ebiggers/libdeflate/master-Release/install/lib"
+CMAKE_PREFIX_PATH = "/Users/cary/builds/src/cary-ilm/Imath/main-Release/install:/Users/cary/builds/src/ebiggers/libdeflate/master-Release/install/lib"
 #CMAKE_PREFIX_PATH = "/home/cary/builds/src/ebiggers/libdeflate/master-Release/install/lib"
 
 CMAKE_CXX_COMPILER = "g++-12"
@@ -62,6 +62,7 @@ CMAKE_C_COMPILER = "gcc-11"
 CMAKE_C_FLAGS = ""
 CMAKE_TOOLCHAIN_FILE=None
 OPENEXR_FORCE_INTERNAL_DEFLATE=None
+OPENEXR_FORCE_INTERNAL_IMATH=None
 OPENEXR_IMAGES_REPO="file:///home/cary/src/AcademySoftwareFoundation/openexr-images"
 #OPENEXR_IMAGES_REPO="file:///home/cary/src/AcademySoftwareFoundation/openexr-images.git"
 OPENEXR_IMAGES_TAG="v1.0"
@@ -163,6 +164,8 @@ for arg in sys.argv[1:]:
         BUILD_TESTING = 0
     elif arg == "deflate":
         OPENEXR_FORCE_INTERNAL_DEFLATE = True
+    elif arg == "imath":
+        OPENEXR_FORCE_INTERNAL_IMATH = True
     elif arg == "aarch64":
         CMAKE_TOOLCHAIN_FILE = "cross-compilation-aarch64.cmake"
         CMAKE_C_COMPILER = "aarch64-linux-gnu-gcc"
@@ -267,8 +270,15 @@ if CMAKE_TOOLCHAIN_FILE:
             
 if cmd == "cmake":
 
-    args = " ".join (args)
-    cmd = "%s %s %s" % (cmake_bin, SRC_DIR, args)
+    print(f"joining: {args}")
+
+    args_quoted = ""
+    for a in args:
+        args_quoted += f' "{a}"' 
+#    args = " ".join (args)
+#    cmd = "%s -S %s -B {build} %s" % (cmake_bin, SRC_DIR, args_quoted)
+    cmd = f"{cmake_bin} -S {SRC_DIR} -B {build} {args_quoted}"
+    print(f"joined: {cmd}")
     if CMAKE_PREFIX_PATH:
         cmd += " -DCMAKE_PREFIX_PATH=%s" % CMAKE_PREFIX_PATH
     cmd += " -DCMAKE_BUILD_TYPE=%s" % CMAKE_BUILD_TYPE
@@ -289,6 +299,8 @@ if cmd == "cmake":
         cmd += "  -DOPENEXR_FORCE_INTERNAL_DEFLATE='ON'"
     if OPENEXR_FORCE_INTERNAL_DEFLATE:
         cmd += "  -DOPENEXR_FORCE_INTERNAL_DEFLATE='ON'"
+    if OPENEXR_FORCE_INTERNAL_IMATH:
+        cmd += "  -DOPENEXR_FORCE_INTERNAL_IMATH='ON'"
     cmd += " -DPYTHON=%s " % PYTHON
     cmd += " -DUSE_PYTHON2=%s " % USE_PYTHON2
     cmd += " -DBUILD_DOCS=%s " % BUILD_DOCS