Resolving dependencies...
Configuring pcre-light-0.4.0.4...
Configuring hscolour-1.24.1...
Building hscolour-1.24.1...
Building pcre-light-0.4.0.4...
Installed pcre-light-0.4.0.4
Installed hscolour-1.24.1
Downloading ghc-core-0.4...
Configuring ghc-core-0.4...
Building ghc-core-0.4...
Failed to install ghc-core-0.4
Build log ( /home/builder/.cabal/logs/ghc-core-0.4.log ):
cabal: Entering directory '/tmp/cabal-tmp-23155/ghc-core-0.4'
Configuring ghc-core-0.4...
Building ghc-core-0.4...
Preprocessing executable 'ghc-core' for ghc-core-0.4...
[1 of 1] Compiling Main             ( ghc-core.hs, dist/build/ghc-core/ghc-core-tmp/Main.o )

ghc-core.hs:120:30: error:
    Ambiguous occurrence ‘readProcess’
    It could refer to either ‘System.Process.readProcess’,
                             imported from ‘System.Process’ at ghc-core.hs:37:1-21
                          or ‘Main.readProcess’, defined at ghc-core.hs:220:1

ghc-core.hs:200:10: error:
    Ambiguous occurrence ‘readProcess’
    It could refer to either ‘System.Process.readProcess’,
                             imported from ‘System.Process’ at ghc-core.hs:37:1-21
                          or ‘Main.readProcess’, defined at ghc-core.hs:220:1

ghc-core.hs:244:14: error:
    Not in scope: data constructor ‘C.ExitException’
    Perhaps you meant one of these:
      ‘C.SomeException’ (imported from Control.Exception),
      variable ‘C.mapException’ (imported from Control.Exception),
      variable ‘C.onException’ (imported from Control.Exception)
    Module ‘Control.Exception’ does not export ‘ExitException’.
cabal: Leaving directory '/tmp/cabal-tmp-23155/ghc-core-0.4'
cabal: Error: some packages failed to install:
ghc-core-0.4 failed during the building phase. The exception was:
ExitFailure 1