[xmonad] Issue 506 in xmonad: cabal install xmonad-contrib --flags="-use_xft" fails with GHC 7.4.1

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Status: New
Owner: ----

New issue 506 by nathan.c... at gmail.com: cabal install xmonad-contrib  
--flags="-use_xft" fails with GHC 7.4.1
http://code.google.com/p/xmonad/issues/detail?id=506

What steps will reproduce the problem?
1. cabal install xmonad
2. cabal install xmonad-contrib --flags="-use_xft"

What is the expected output? What do you see instead?

Expect it to install, instead I get an error about needing  
-XDatatypeContexts.

What version of the product are you using? On what operating system?

xmonad-contrib-0.10 on Ubuntu 11.04 using GHC 7.4.1

Please provide any additional information below.

I can successfully install by adding the suggested GHC option:

   cabal install xmonad-contrib --flags="-use_xft"  
--ghc-option=-XDatatypeContexts