cabal: cannot configure safe-freeze-0.0. It requires base <4.2
For the dependency on base <4.2 there are these packages: base-3.0.3.1,
base-3.0.3.2, base-4.0.0.0 and base-4.1.0.0. However none of them are
available.
base-3.0.3.1 was excluded because of the top level dependency base -any
base-3.0.3.2 was excluded because of the top level dependency base -any
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