diff -u ./Rendering/OpenGL2/CMakeLists.txt.orig ./Rendering/OpenGL2/CMakeLists.txt
--- ./Rendering/OpenGL2/CMakeLists.txt.orig	2021-11-03 14:33:11.582334000 -0700
+++ ./Rendering/OpenGL2/CMakeLists.txt	2021-11-03 14:36:50.263234000 -0700
@@ -194,7 +194,7 @@
   if(NOT X11_Xt_FOUND)
     message(FATAL_ERROR "X11_Xt_LIB could not be found. Required for VTK X lib.")
   endif()
-  include_directories(${X11_INCLUDE_DIR} ${X11_Xt_INCLUDE_PATH})
+  include_directories(${X11_INCLUDE_DIR} ${X11_SM_INCLUDE_PATH} ${X11_ICE_INCLUDE_PATH} ${X11_Xt_INCLUDE_PATH})
 endif()
 
 # setup factory overrides