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Building call-stack-0.1.0...
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Installed zlib-0.6.1.2
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Configuring pretty-show-1.6.12...
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Building github-0.15.0...
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Downloading github-backup-1.20150618...
Configuring github-backup-1.20150618...
Failed to install github-backup-1.20150618
Build log ( /home/builder/.cabal/logs/github-backup-1.20150618.log ):
cabal: Entering directory '/tmp/cabal-tmp-7522/github-backup-1.20150618'
cabal: Leaving directory '/tmp/cabal-tmp-7522/github-backup-1.20150618'
cabal: Error: some packages failed to install:
github-backup-1.20150618 failed during the configure step. The exception was:
user error ('/opt/ghc/8.0.2/bin/ghc' exited with an error:

/tmp/cabal-tmp-7522/github-backup-1.20150618/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-7522/github-backup-1.20150618/Utility/Directory.hs:14:1-23
or ‘Utility.PosixFiles.isSymbolicLink’,
imported from ‘Utility.PosixFiles’ at
/tmp/cabal-tmp-7522/github-backup-1.20150618/Utility/Directory.hs:30:1-25
(and originally defined in ‘unix-2.7.2.0:System.Posix.Files.Common’)
)