Resolving dependencies...
Configuring Diff-0.3.4...
Configuring ansi-terminal-0.6.2.3...
Building Diff-0.3.4...
Building ansi-terminal-0.6.2.3...
Installed Diff-0.3.4
Configuring base-compat-0.9.1...
Building base-compat-0.9.1...
Configuring mtl-2.2.1...
Installed ansi-terminal-0.6.2.3
Building mtl-2.2.1...
Configuring transformers-compat-0.5.1.4...
Installed base-compat-0.9.1
Building transformers-compat-0.5.1.4...
Configuring ansi-wl-pprint-0.6.7.3...
Installed mtl-2.2.1
Building ansi-wl-pprint-0.6.7.3...
Installed transformers-compat-0.5.1.4
Installed ansi-wl-pprint-0.6.7.3
Configuring optparse-applicative-0.13.0.0...
Building optparse-applicative-0.13.0.0...
Installed optparse-applicative-0.13.0.0
Configuring git-mediate-1.0...
Building git-mediate-1.0...
Failed to install git-mediate-1.0
Build log ( /home/builder/.cabal/logs/git-mediate-1.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-27039/git-mediate-1.0'
Configuring git-mediate-1.0...
Building git-mediate-1.0...
Preprocessing executable 'git-mediate' for git-mediate-1.0...
[1 of 3] Compiling PPDiff           ( PPDiff.hs, dist/build/git-mediate/git-mediate-tmp/PPDiff.o )
[2 of 3] Compiling Opts             ( Opts.hs, dist/build/git-mediate/git-mediate-tmp/Opts.o )

Opts.hs:14:1: error:
    Failed to load interface for ‘Version’
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-27039/git-mediate-1.0'
cabal: Error: some packages failed to install:
git-mediate-1.0 failed during the building phase. The exception was:
ExitFailure 1