[xmonad] xmonad-contrib fails to build

[Ivan Lazar Miljenovic]

On 20 November 2010 21:51, Tony Morris <tonymorris at gmail.com> wrote:
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> Hello,
> xmonad-contrib 0.9.1 is failing to build with GHC 6.12.1. I was
> wondering if upgrading to GHC 6.12.3 would fix this. If not, then what
> other options are there?
>
> $ cabal install xmonad-contrib
> Resolving dependencies...
> Configuring xmonad-contrib-0.9.1...
> Preprocessing library xmonad-contrib-0.9.1...
> Building xmonad-contrib-0.9.1...
> [  1 of 180] Compiling XMonad.Util.Replace ( XMonad/Util/Replace.hs,
> dist/build/XMonad/Util/Replace.o )
>
> XMonad/Util/Replace.hs:1:0:
>    Warning: Module `Prelude' is deprecated:
>               You are using the old package `base' version 3.x.
>               Future GHC versions will not support base version 3.x. You
>               should update your code to use the new base version 4.x.
> [  2 of 180] Compiling XMonad.Util.CustomKeys (
> XMonad/Util/CustomKeys.hs, dist/build/XMonad/Util/CustomKeys.o )
>
> XMonad/Util/CustomKeys.hs:80:23:
>    Not in scope: data constructor `Reader'
> cabal: Error: some packages failed to install:
> xmonad-contrib-0.9.1 failed during the building phase. The exception was:
> ExitFailure 1

I'm going to randomly guess that this is an mtl-2 problem: cabal
install xmonad-contrib --constraint="mtl < 2"

-- 
Ivan Lazar Miljenovic
Ivan.Miljenovic at gmail.com
IvanMiljenovic.wordpress.com