Resolving dependencies...
Configuring mtl-2.2.1...
Configuring primitive-0.6.1.0...
Building mtl-2.2.1...
Building primitive-0.6.1.0...
Installed mtl-2.2.1
Configuring text-1.2.2.1...
Configuring utf8-string-1.0.1.1...
Installed primitive-0.6.1.0
Building text-1.2.2.1...
Building utf8-string-1.0.1.1...
Installed utf8-string-1.0.1.1
Configuring vector-0.11.0.0...
Building vector-0.11.0.0...
Installed text-1.2.2.1
Configuring hashable-1.2.4.0...
Building hashable-1.2.4.0...
Installed hashable-1.2.4.0
Installed vector-0.11.0.0
Configuring sequor-0.2...
Building sequor-0.2...
Failed to install sequor-0.2
Build log ( /home/builder/.cabal/logs/sequor-0.2.log ):
cabal: Entering directory '/tmp/cabal-tmp-13444/sequor-0.2'
Configuring sequor-0.2...
Building sequor-0.2...
Preprocessing executable 'sequor' for sequor-0.2...
[ 1 of 13] Compiling Utils            ( lib/haskell-utils/Utils.hs, dist/build/sequor/sequor-tmp/Utils.o )
[ 2 of 13] Compiling Text             ( lib/haskell-utils/Text.hs, dist/build/sequor/sequor-tmp/Text.o )
[ 3 of 13] Compiling ListZipper       ( lib/haskell-utils/ListZipper.hs, dist/build/sequor/sequor-tmp/ListZipper.o )
[ 4 of 13] Compiling FeatureTemplate  ( src/FeatureTemplate.hs, dist/build/sequor/sequor-tmp/FeatureTemplate.o )
[ 5 of 13] Compiling CorpusReader     ( src/CorpusReader.hs, dist/build/sequor/sequor-tmp/CorpusReader.o )
[ 6 of 13] Compiling Commands         ( lib/haskell-utils/Commands.hs, dist/build/sequor/sequor-tmp/Commands.o )

lib/haskell-utils/Commands.hs:16:1: error:
    Failed to load interface for ‘System.IO.UTF8’
    Use -v to see a list of the files searched for.
cabal: Leaving directory '/tmp/cabal-tmp-13444/sequor-0.2'
cabal: Error: some packages failed to install:
sequor-0.2 failed during the building phase. The exception was:
ExitFailure 1