Resolving dependencies...
Downloading cpython-3.1.3...
Configuring cpython-3.1.3...
cabal: The pkg-config package python-3.1 is required but it could not be
found.
Failed to install cpython-3.1.3
cabal: Error: some packages failed to install:
cpython-3.1.3 failed during the configure step. The exception was:
ExitFailure 1