--- extern/CMakeLists.txt.orig	2016-03-30 16:08:58 UTC
+++ extern/CMakeLists.txt
@@ -1,5 +1,4 @@
 include(CMakeProject-lua.cmake)
-include(CMakeProject-glew.cmake)
 include(CMakeProject-json.cmake)
 if (APPLE OR MSVC)
   include(CMakeProject-mad.cmake)
@@ -16,5 +15,4 @@ if (NOT SYSTEM_PCRE_FOUND)
 endif()
 include(CMakeProject-tomcrypt.cmake)
 include(CMakeProject-tommath.cmake)
-include(CMakeProject-png.cmake)