We should be able to delete this when we update to version that has this change
included.

diff --git a/Source/cmake/FindOpenGL.cmake b/Source/cmake/FindOpenGL.cmake
index dceb67fa63a2578b4f7ec8f4186013f1043bb53c..60721cdb92ed2c9be47053c9c4afc9c6b461fb4e 100644
--- a/Source/cmake/FindOpenGL.cmake
+++ b/Source/cmake/FindOpenGL.cmake
@@ -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 ()
--- a/Source/cmake/FindWebP.cmake	2016-07-01 15:00:14.186428253 -0700
+++ b/Source/cmake/FindWebP.cmake	2016-07-01 15:00:52.058759138 -0700
@@ -35,6 +35,7 @@
 if (NOT(WEBP_FOUND))
     # Older installations of libwebp do not install a pkgconfig file, so we fall
     # back to a manual search for a libwebp header file.
+    include(CheckIncludeFiles)
     check_include_files("webp/decode.h" WEBP_FOUND_HEADER)
     if (WEBP_FOUND_HEADER)
         set(WEBP_LIBRARIES "-lwebp")