Resolving dependencies...
Downloading dual-0.1.0.0...
Configuring dual-0.1.0.0...
Building dual-0.1.0.0...
Failed to install dual-0.1.0.0
Build log ( /home/builder/.cabal/logs/dual-0.1.0.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-27365/dual-0.1.0.0'
Configuring dual-0.1.0.0...
Building dual-0.1.0.0...
Preprocessing library dual-0.1.0.0...
cabal: can't find source for Control/Category/Dual in ., dist/build/autogen
cabal: Leaving directory '/tmp/cabal-tmp-27365/dual-0.1.0.0'
cabal: Error: some packages failed to install:
dual-0.1.0.0 failed during the building phase. The exception was:
ExitFailure 1