gentoo-overlay/dev-games/ogre/files/ogre-2.1-fix_opengl_search.patch

--- a/CMake/Dependencies.cmake	2020-04-27 15:59:25.005877828 +0200
+++ b/CMake/Dependencies.cmake	2020-04-27 15:59:42.572876732 +0200
@@ -111,6 +111,9 @@
 #######################################################################
 
 # Find OpenGL
+if(POLICY CMP0072)
+  cmake_policy(SET CMP0072 NEW)
+endif()
 if(NOT ANDROID AND NOT EMSCRIPTEN)
   find_package(OpenGL)
   macro_log_feature(OPENGL_FOUND "OpenGL" "Support for the OpenGL render system" "http://www.opengl.org/" FALSE "" "")