Resolving dependencies...
Starting     StateVar-1.2.2
Starting     hashable-1.4.1.0
Starting     colour-2.3.6
Starting     base-orphans-0.8.7
Building     StateVar-1.2.2
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Starting     indexed-traversable-0.1.2
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Starting     monads-tf-0.1.0.3
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Starting     primitive-0.7.4.0
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Starting     transformers-compat-0.7.2
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Starting     unix-compat-0.6
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Starting     utf8-string-1.0.2
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Starting     contravariant-1.5.5
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Starting     ansi-terminal-0.11.3
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Starting     unordered-containers-0.2.19.1
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Starting     distributive-0.6.2.1
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Downloading  language-python-0.5.8
Downloaded   language-python-0.5.8
Starting     language-python-0.5.8
Building     language-python-0.5.8
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Downloading  xcb-types-0.11.0
Downloaded   xcb-types-0.11.0
Starting     xcb-types-0.11.0
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Starting     comonad-5.0.8
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Starting     attoparsec-0.14.4
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Starting     optparse-applicative-0.17.0.0
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Starting     bifunctors-5.5.13
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Starting     profunctors-5.6.2
Starting     semigroupoids-5.3.7
Building     profunctors-5.6.2
Building     semigroupoids-5.3.7
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Starting     either-5.0.2
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Completed    language-python-0.5.8
Downloading  xcffib-0.12.0
Downloaded   xcffib-0.12.0
Starting     xcffib-0.12.0
Building     xcffib-0.12.0
Completed    xcffib-0.12.0
Warning: could not create a symlink in /home/builder/.cabal/bin for xcffibgen
because the file exists there already but is not managed by cabal. You can
create a symlink for this executable manually if you wish. The executable file
has been installed at
/home/builder/hackage-server/build-cache/tmp-install/bin/xcffibgen