diff -up webkitgtk-2.10.1/Source/cmake/FindOpenGL.cmake.cmake_fix webkitgtk-2.10.1/Source/cmake/FindOpenGL.cmake
--- webkitgtk-2.10.1/Source/cmake/FindOpenGL.cmake.cmake_fix	2015-10-14 10:17:48.757312333 +0200
+++ webkitgtk-2.10.1/Source/cmake/FindOpenGL.cmake	2015-10-14 10:25:34.681328240 +0200
@@ -59,6 +59,7 @@ if (OPENGL_FOUND)
     include(CMakePushCheckState)
     CMAKE_PUSH_CHECK_STATE()
     set(CMAKE_REQUIRED_INCLUDES ${CMAKE_REQUIRED_INCLUDES} ${OPENGL_INCLUDE_DIRS})
+    include(CheckIncludeFiles)
     check_include_files("GL/glx.h" GLX_FOUND)
     CMAKE_POP_CHECK_STATE()
 endif ()