Looks like http://www.haskell.org/cabal/FAQ.html has a description of your problem!

2010/11/3 André Batista Martins <andre_bm@netcabo.pt>
Hi Johan,
 i already try use Criterion but i couldn't install with cabal :S i get error:
 

cabal install criterion
Resolving dependencies...
cabal: dependencies conflict: ghc-6.12.1 requires array ==0.3.0.1 however
array-0.3.0.1 was excluded because ghc-6.12.1 requires array ==0.3.0.0


Anyone can help?


No dia 3 de Novembro de 2010 16:33, Johan Tibell <johan.tibell@gmail.com> escreveu:

Hi André,

Have a look at the Criterion benchmarking package:

   http://hackage.haskell.org/package/criterion

Johan


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