Cabal install cabal-install cannot resolve dependencies

Question

I just made a brew install haskell-platform and installed the Glorious Glasgow Haskell compilation system version 7.6.3.

 $ cabal --version cabal-install version 1.16.0.2 using version 1.16.0 of the Cabal library $ cabal update Downloading the latest package list from hackage.haskell.org Note: there is a new version of cabal-install available. To upgrade, run: cabal install cabal-install $ cabal install cabal-install Resolving dependencies... cabal: Could not resolve dependencies: trying: cabal-install-1.20.0.3 rejecting: zlib-0.5.4.1, 0.5.4.0, 0.5.3.3, 0.5.3.2, 0.5.3.1, 0.5.2.0, 0.5.0.0, 0.4.0.4, 0.4.0.3, 0.4.0.2, 0.4.0.1, 0.4, 0.3, 0.2 (global constraint requires installed instance) 

I don’t understand what the problem is, I just installed everything for the first time.

Answer 1

I just had the ~/.cabal/config file damaged before installation.

I did

 $ rm -rf ~/.ghc ~/.cabal $ brew rm ghc $ brew rm haskell-platform $ brew install haskell-platform 

and he set OK

 $ cabal install cabal-install Resolving dependencies... Downloading Cabal-1.20.0.2... ...