diff --git a/ChangeLog b/ChangeLog
index 78def1967..cc59d90a4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,13 @@
+2008-06-05  Tommi Komulainen  <tommi.komulainen@iki.fi>
+
+	Bug 913 - cogl fails to build on OSX
+
+	* clutter/cogl/gl/cogl-fbo.c: define GL_READ_FRAMEBUFFER_EXT and
+	GL_DRAW_FRAMEBUFFER_EXT if not defined in the build system. The
+	#ifdef can fail if they're not #defines but variables or enums.
+	As the values are supposed to be industry standard even then
+	it shouldn't have ill effects.
+
 2008-06-05  Tommi Komulainen  <tommi.komulainen@iki.fi>
 
 	Bug #911 - OSX: add multistage support
diff --git a/clutter/cogl/gl/cogl-fbo.c b/clutter/cogl/gl/cogl-fbo.c
index d920dd96b..ae598461d 100644
--- a/clutter/cogl/gl/cogl-fbo.c
+++ b/clutter/cogl/gl/cogl-fbo.c
@@ -48,6 +48,13 @@
 #define glBlitFramebufferEXT                 ctx->pf_glBlitFramebufferEXT
 #define glRenderbufferStorageMultisampleEXT  ctx->pf_glRenderbufferStorageMultisampleEXT
 
+#ifndef GL_READ_FRAMEBUFFER_EXT
+#define GL_READ_FRAMEBUFFER_EXT 0x8CA8
+#endif
+#ifndef GL_DRAW_FRAMEBUFFER_EXT
+#define GL_DRAW_FRAMEBUFFER_EXT 0x8CA9
+#endif
+
 static void _cogl_offscreen_free (CoglFbo *fbo);
 
 COGL_HANDLE_DEFINE (Fbo, offscreen, fbo_handles);