Resolving dependencies...
Configuring mtl-2.2.1...
Configuring text-1.2.2.1...
Building mtl-2.2.1...
Building text-1.2.2.1...
Configuring wl-pprint-1.2...
Installed mtl-2.2.1
Building wl-pprint-1.2...
Installed wl-pprint-1.2
Installed text-1.2.2.1
Configuring parsec-3.1.11...
Building parsec-3.1.11...
Installed parsec-3.1.11
Configuring hgom-0.6...
Building hgom-0.6...
Failed to install hgom-0.6
Build log ( /home/builder/.cabal/logs/hgom-0.6.log ):
cabal: Entering directory '/tmp/cabal-tmp-30499/hgom-0.6'
Configuring hgom-0.6...
Building hgom-0.6...
Preprocessing executable 'hgom' for hgom-0.6...
[ 1 of 20] Compiling Gom.Sig          ( Gom/Sig.hs, dist/build/hgom/hgom-tmp/Gom/Sig.o )
[ 2 of 20] Compiling Gom.Pretty       ( Gom/Pretty.hs, dist/build/hgom/hgom-tmp/Gom/Pretty.o )
[ 3 of 20] Compiling Gom.Parser       ( Gom/Parser.hs, dist/build/hgom/hgom-tmp/Gom/Parser.o )
[ 4 of 20] Compiling Gom.FileGen      ( Gom/FileGen.hs, dist/build/hgom/hgom-tmp/Gom/FileGen.o )

Gom/FileGen.hs:79:38: error:
    Ambiguous occurrence ‘<$>’
    It could refer to either ‘Prelude.<$>’,
                             imported from ‘Prelude’ at Gom/FileGen.hs:18:8-18
                             (and originally defined in ‘Data.Functor’)
                          or ‘Text.PrettyPrint.Leijen.<$>’,
                             imported from ‘Text.PrettyPrint.Leijen’ at Gom/FileGen.hs:23:1-30
cabal: Leaving directory '/tmp/cabal-tmp-30499/hgom-0.6'
cabal: Error: some packages failed to install:
hgom-0.6 failed during the building phase. The exception was:
ExitFailure 1