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Building github-0.15.0...
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Configuring github-backup-1.20150807...
Failed to install github-backup-1.20150807
Build log ( /home/builder/.cabal/logs/github-backup-1.20150807.log ):
cabal: Entering directory '/tmp/cabal-tmp-30175/github-backup-1.20150807'
cabal: Leaving directory '/tmp/cabal-tmp-30175/github-backup-1.20150807'
cabal: Error: some packages failed to install:
github-backup-1.20150807 failed during the configure step. The exception was:
user error ('/opt/ghc/8.0.2/bin/ghc' exited with an error:

/tmp/cabal-tmp-30175/github-backup-1.20150807/Utility/Directory.hs:79:43:
error:
Ambiguous occurrence ‘isSymbolicLink’
It could refer to either ‘System.Directory.isSymbolicLink’,
imported from ‘System.Directory’ at
/tmp/cabal-tmp-30175/github-backup-1.20150807/Utility/Directory.hs:14:1-23
or ‘Utility.PosixFiles.isSymbolicLink’,
imported from ‘Utility.PosixFiles’ at
/tmp/cabal-tmp-30175/github-backup-1.20150807/Utility/Directory.hs:31:1-25
(and originally defined in ‘unix-2.7.2.0:System.Posix.Files.Common’)
)