cabal install hdevtools

cabal: Package unix-2.6.0.1 can't be built on this system.
Failed to install unix-2.6.0.1
cabal: Error: some packages failed to install:
hdevtools-0.1.0.5 depends on unix-2.6.0.1 which failed to install.
unix-2.6.0.1 failed during the building phase. The exception was:
ExitFailure 1