--- ember-0.5.6/configure.fix_implicit_dso	2009-03-29 14:39:35.000000000 +0200
+++ ember-0.5.6/configure	2010-07-04 16:01:47.645285571 +0200
@@ -22510,7 +22510,7 @@
 $as_echo "$ac_cv_lib_GL_glViewport" >&6; }
 if test "x$ac_cv_lib_GL_glViewport" = x""yes; then
 
-    LIBS="$LIBS -lGL"
+    LIBS="$LIBS -lGL -lX11"
 	CXXFLAGS="$CXXFLAGS -I/usr/X11R6/include -I/usr/include"
 
 else