Resolving dependencies...
Configuring ansi-terminal-0.6.2.3...
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Installed base-compat-0.9.1
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Configuring base64-bytestring-1.0.0.1...
Installed base-orphans-0.5.4
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Configuring byteable-0.1.1...
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Installed byteable-0.1.1
Configuring cereal-0.5.4.0...
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Building call-stack-0.1.0...
Building cereal-0.5.4.0...
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Configuring dlist-0.8.0.2...
Installed cereal-0.5.4.0
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Configuring hourglass-0.2.10...
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Building mtl-2.2.1...
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Configuring network-2.6.3.1...
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Building zlib-0.6.1.2...
Configuring ansi-wl-pprint-0.6.7.3...
Installed text-1.2.2.1
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Building ansi-wl-pprint-0.6.7.3...
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Installed ansi-wl-pprint-0.6.7.3
Configuring pretty-show-1.6.12...
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Building hslogger-1.2.10...
Configuring socks-0.5.5...
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Building socks-0.5.5...
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Building blaze-builder-0.4.0.2...
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Installed errors-2.1.3
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Installed hashable-1.2.4.0
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Building github-0.15.0...
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Downloading github-backup-1.20150807...
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-19511/github-backup-1.20150807'
cabal: Leaving directory '/tmp/cabal-tmp-19511/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-19511/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-19511/github-backup-1.20150807/Utility/Directory.hs:14:1-23
or ‘Utility.PosixFiles.isSymbolicLink’,
imported from ‘Utility.PosixFiles’ at
/tmp/cabal-tmp-19511/github-backup-1.20150807/Utility/Directory.hs:31:1-25
(and originally defined in ‘unix-2.7.2.0:System.Posix.Files.Common’)
)