Resolving dependencies...
Configuring util-0.1.1.0...
Building util-0.1.1.0...
Failed to install util-0.1.1.0
Build log ( /home/builder/.cabal/logs/util-0.1.1.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-4355/util-0.1.1.0'
Configuring util-0.1.1.0...
Building util-0.1.1.0...
Preprocessing library util-0.1.1.0...
[1 of 1] Compiling Util             ( Util.hs, dist/build/Util.o )

Util.hs:89:81: error:
    Ambiguous occurrence ‘<>’
    It could refer to either ‘Data.Semigroup.<>’,
                             imported from ‘Data.Semigroup’ at Util.hs:10:1-21
                          or ‘Data.Monoid.<>’,
                             imported from ‘Data.Monoid’ at Util.hs:11:1-18

Util.hs:92:15: error:
    Ambiguous occurrence ‘<>’
    It could refer to either ‘Data.Semigroup.<>’,
                             imported from ‘Data.Semigroup’ at Util.hs:10:1-21
                          or ‘Data.Monoid.<>’,
                             imported from ‘Data.Monoid’ at Util.hs:11:1-18
cabal: Leaving directory '/tmp/cabal-tmp-4355/util-0.1.1.0'
cabal: Error: some packages failed to install:
util-0.1.1.0 failed during the building phase. The exception was:
ExitFailure 1