When checking for glew via cmake check to see that the system version of glew

is at least 1.8 and has the methods of glew 1.9.  This is an annoying
hack to deal with Ubuntu's glew setup, which is glew 1.8 with 1.9
methods patched in.

CMakeLists.txt

@@ -646,7 +646,7 @@ if(WIN32)
 else()
 	if(NOT ANDROID)
 		if(NOT ${CMAKE_SYSTEM_NAME} MATCHES "Darwin")
-			check_lib(GLEW GLEW GL/glew.h)
+			include(FindGLEW)
 		endif()
 		if(NOT GLEW_FOUND)
 			message("Using static GLEW from Externals")

CMakeTests/FindGLEW.cmake

@@ -0,0 +1,35 @@
+include(FindPkgConfig OPTIONAL)
+
+# This is a hack to deal with Ubuntu's mess.
+# Ubuntu's version of glew is 1.8, but they have patched in most of glew 1.9.
+# So Ubuntu's version works for dolphin.
+macro(test_glew)
+	set(CMAKE_REQUIRED_INCLUDES ${GLEW_INCLUDE_DIRS})
+	set(CMAKE_REQUIRED_LIBRARIES GLEW)
+	check_cxx_source_runs("
+	#include <GL/glew.h>
+	int main()
+	{
+	#ifdef GLEW_ARB_shader_image_load_store
+	return 0;
+	#else
+	return 1;
+	#endif
+	}"
+	GLEW_HAS_1_9_METHODS)
+endmacro()
+
+if(PKG_CONFIG_FOUND AND NOT ${var}_FOUND)
+	pkg_search_module(GLEW REQUIRED glew>=1.8)
+endif()
+
+if(GLEW_FOUND)
+	test_glew()
+	if (GLEW_HAS_1_9_METHODS)
+		include_directories(${GLEW_INCLUDE_DIRS})
+		message("GLEW found")
+	else()
+		set($GLEW_FOUND 0 CACHE INTERNAL "")
+		message(FATAL_ERROR "A version of GLEW with the required methods was not found")
+	endif()
+endif()