OK! I agree with what is on the first e-mail from [arch-haskell]. Vesa idea is quite good. I quote here: > Future====== > The actions I'm about to do are following: > - remove haskell-platform and all its libs from extra - only > keep ghc in extra - alex, happy and cabal-install and the libs they > need (5-10) go to community http://www.haskell.org/pipermail/arch-haskell/2011-November/001736.html My question was about the ghc version 7.2.2 instead of 7.0.3. The reason Haskell Platform did not 'upgrade' it is because it is a "technology preview' release as you can read in announcement: > The 7.2 branch is intended to be more of a "technology preview" than > normal GHC stable branches; in particular, it supports a > significantly improved version of DPH, as well as new features such > as compiler plugins and "safe Haskell". The design of these new > features may evolve as we get more experience with them. http://hackage.haskell.org/trac/ghc/browser/ANNOUNCE?rev=78e1c3ce65af0594fd01717d3661ce8ce6d3be2e And I wonder if would be better to wait until the next "production" release to upgrade ghc in [extra]