--- xmobar.cabal.orig	2012-06-23 16:00:20.668999533 +0300
+++ xmobar.cabal	2012-06-23 16:01:42.749000428 +0300
@@ -112,7 +112,7 @@
       time,
       filepath,
       X11 == 1.6.*,
-      mtl == 2.0.*,
+      mtl >= 2.0.0 && < 2.2, 
       parsec == 3.1.*,
       stm == 2.3.*