--- qt-3.3.3.ebuild.orig	2004-08-23 15:53:54.695432904 +0200
+++ qt-3.3.3.ebuild	2004-08-23 15:58:49.287648080 +0200
@@ -58,6 +58,15 @@
 		ewarn "Be aware."
 		ewarn
 	fi
+	if use opengl ; then
+		if ! [ -e /usr/X11R6/include/GL/glext.h ] ; then
+			ewarn
+			ewarn "You are going to compile Qt with opengl support."
+			ewarn "It's necessary that you run opengl-update first or the Qt meight will fail."
+			ewarn
+			die
+		fi
+	fi
 }
 
 src_unpack() {