13 Mar
                
                    2015
                
            
            
                13 Mar
                
                '15
                
            
            
            
        
    
                12:39 p.m.
            
        I want to upgrade from 7.8.3 32 bits to 7.8.4 64 bits on Arch Linux. So I removed ghc, cabal etc and followed the instruction at:
Arch user here. Did you try without the additional repository? As far as I can tell, all required packages are already in [extra] and [community] (even 'haddock' is there).
http://sapiengames.com/2014/04/05/install-haskell-platform-arch-linux/
I would advise to not follow this article. You should not 'sudo cabal install' anything. Cheers Lars