echo 'Creating brew-patch.diff'
cat << EOF >> brew-patch.diff
diff --git a/CMakeModules/FindGtkGl.cmake b/CMakeModules/FindGtkGl.cmake
index 321cede..6497589 100644
--- a/CMakeModules/FindGtkGl.cmake
+++ b/CMakeModules/FindGtkGl.cmake
@@ -10,7 +10,7 @@ IF(PKG_CONFIG_FOUND)
     IF(WIN32)
         PKG_CHECK_MODULES(GTKGL gtkglext-win32-1.0)
     ELSE()
-        PKG_CHECK_MODULES(GTKGL gtkglext-x11-1.0)
+        PKG_CHECK_MODULES(GTKGL gtkglext-quartz-1.0)
     ENDIF()

 ENDIF()
EOF