cabal: cannot configure darcs-beta-2.7.98.3. It requires base >=4 && <4.4
For the dependency on base >=4 && <4.4 there are these packages: base-4.0.0.0,
base-4.1.0.0, base-4.2.0.0, base-4.2.0.1, base-4.2.0.2, base-4.3.0.0 and
base-4.3.1.0. However none of them are available.
base-4.0.0.0 was excluded because of the top level dependency base -any
base-4.1.0.0 was excluded because of the top level dependency base -any
base-4.2.0.0 was excluded because of the top level dependency base -any
base-4.2.0.1 was excluded because of the top level dependency base -any
base-4.2.0.2 was excluded because of the top level dependency base -any
base-4.3.0.0 was excluded because of the top level dependency base -any
base-4.3.1.0 was excluded because of the top level dependency base -any