Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: cpython (user goal)
rejecting: cpython-3.4.0, cpython-3.3.1, cpython-3.3.0, cpython-3.2.0
(constraint from user target requires ==3.1.4)
rejecting: cpython-3.1.4 (conflict: requires pkg-config package
python-3.1-any, not found in the pkg-config database)
rejecting: cpython-3.1.3, cpython-3.1.2.1, cpython-3.1.2.0, cpython-3.1.1.0,
cpython-3.1.0 (constraint from user target requires ==3.1.4)
Dependency tree exhaustively searched.