kdiff -p -up ./cogl/cogl-1.0.pc.in.orig ./cogl/cogl-1.0.pc.in
--- ./cogl/cogl-1.0.pc.in.orig	2012-01-17 19:08:26.504633855 +0000
+++ ./cogl/cogl-1.0.pc.in	2012-01-17 19:08:47.276376942 +0000
@@ -3,7 +3,7 @@ exec_prefix=@exec_prefix@
 libdir=@libdir@
 includedir=@includedir@
 apiversion=1.0
-requires=@COGL_PKG_REQUIRES@
+requires=@COGL_PKG_REQUIRES@ gl
 
 Name: Cogl
 Description: An object oriented GL/GLES Abstraction/Utility Layer
