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 syb-0.6...
Configuring utf8-string-1.0.1.1...
Installed primitive-0.6.1.0
Building syb-0.6...
Building utf8-string-1.0.1.1...
Configuring text-1.2.2.1...
Installed syb-0.6
Building text-1.2.2.1...
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 parsec-3.1.11...
Building parsec-3.1.11...
Configuring hashable-1.2.4.0...
Installed parsec-3.1.11
Building hashable-1.2.4.0...
Installed vector-0.11.0.0
Configuring json-0.9.1...
Building json-0.9.1...
Installed hashable-1.2.4.0
Configuring hashtables-1.2.1.0...
Building hashtables-1.2.1.0...
Installed json-0.9.1
Installed hashtables-1.2.1.0
Configuring HsSyck-0.53...
Building HsSyck-0.53...
Installed HsSyck-0.53
Configuring json2yaml-0.0.0...
Building json2yaml-0.0.0...
Failed to install json2yaml-0.0.0
Build log ( /home/builder/.cabal/logs/json2yaml-0.0.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-17545/json2yaml-0.0.0'
Configuring json2yaml-0.0.0...
Building json2yaml-0.0.0...
Preprocessing executable 'json2yaml' for json2yaml-0.0.0...
[1 of 1] Compiling Main             ( json2yaml.hs, dist/build/json2yaml/json2yaml-tmp/Main.o )

json2yaml.hs:4:1: 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-17545/json2yaml-0.0.0'
cabal: Error: some packages failed to install:
json2yaml-0.0.0 failed during the building phase. The exception was:
ExitFailure 1