diff -Naur OCCT-7_8_1-orig/CMakeLists.txt OCCT-7_8_1/CMakeLists.txt
--- OCCT-7_8_1-orig/CMakeLists.txt	2024-03-31 15:05:22.000000000 -0700
+++ OCCT-7_8_1/CMakeLists.txt	2026-05-23 02:41:32.430456332 -0700
@@ -623,6 +623,14 @@
   add_definitions (-DHAVE_VTK)
   set (OCCT_VTK_USED_TARGETS "" CACHE INTERNAL "" FORCE)
   OCCT_INCLUDE_CMAKE_FILE ("adm/cmake/vtk")
+
+  if (NOT CAN_USE_TK OR NOT USE_TK)
+    list (FIND BUILD_TOOLKITS TKIVtkDraw _HAS_TKIVTKDRAW)
+    if (NOT _HAS_TKIVTKDRAW EQUAL -1)
+      message (STATUS "Info: TKIVtkDraw toolkit excluded due to TK not being available")
+      list (REMOVE_ITEM BUILD_TOOLKITS TKIVtkDraw)
+    endif()
+  endif()
 else()
   OCCT_CHECK_AND_UNSET_GROUP ("3RDPARTY_VTK")
 
diff -Naur OCCT-7_8_1-orig/src/TKIVtkDraw/EXTERNLIB OCCT-7_8_1/src/TKIVtkDraw/EXTERNLIB
--- OCCT-7_8_1-orig/src/TKIVtkDraw/EXTERNLIB	2024-03-31 15:05:22.000000000 -0700
+++ OCCT-7_8_1/src/TKIVtkDraw/EXTERNLIB	2026-05-23 02:41:54.414562419 -0700
@@ -1,5 +1,6 @@
 CSF_VTK
 CSF_TclLibs
+CSF_TclTkLibs
 CSF_XwLibs
 CSF_user32
 TKernel