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-rw-r--r--xmonad.cabal4
1 files changed, 4 insertions, 0 deletions
diff --git a/xmonad.cabal b/xmonad.cabal
index 4a3d726..9a7929e 100644
--- a/xmonad.cabal
+++ b/xmonad.cabal
@@ -71,6 +71,10 @@ library
if impl(ghc >= 6.12.1)
ghc-options: -fno-warn-unused-do-bind
+ if impl(ghc < 7.0.0)
+ extensions: UndecidableInstances
+ -- needed for XMonad.Config's instance Default (XConfig a)
+
ghc-prof-options: -prof -auto-all