From 95799bd3641ebe43400aa85dd8cf84405f26aac8 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Mon, 31 Aug 2020 16:17:04 +0200
Subject: Fix for cmake + macOS + OPTION_APPLE_X11 regarding GLU-using apps.

---
 CMake/options.cmake | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/CMake/options.cmake b/CMake/options.cmake
index 0153a1923..ac7fa5bb6 100644
--- a/CMake/options.cmake
+++ b/CMake/options.cmake
@@ -195,8 +195,8 @@ if (OPTION_USE_GL)
   if (OPTION_APPLE_X11)
     set (OPENGL_FOUND TRUE)
     set (OPENGL_LIBRARIES -L${PATH_TO_XLIBS} -lGLU -lGL)
-    find_file (TEMP_HAVE_GL_GLU_H GL/glu.h PATHS /opt/X11/include)
-    set (HAVE_GL_GLU_H ${TEMP_HAVE_GL_GLU_H})
+    unset(HAVE_GL_GLU_H CACHE)
+    find_file (HAVE_GL_GLU_H GL/glu.h PATHS ${X11_INCLUDE_DIR})
   elseif (OPTION_APPLE_SDL)
     set (OPENGL_FOUND FALSE)
   else()
-- 
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