Darcs is a free, open source revision control system written in
Haskell.

To run the test suite, additionally haskell-HUnit,
haskell-ansi-terminal, haskell-hostname, haskell-xml,
haskell-ansi-wl-pprint, haskell-QuickCheck, haskell-test-framework,
haskell-test-framework-hunit, and haskell-test-framework-quickcheck2
are required.

After uninstalling, run this command to unregister the package from
the ghc package database:   ghc-pkg recache