cabal: cannot configure mtl-2.0.1.0. It requires transformers ==0.2.*
For the dependency on transformers ==0.2.* there are these packages:
transformers-0.2.0.0, transformers-0.2.1.0 and transformers-0.2.2.0. However
none of them are available.
transformers-0.2.0.0 was excluded because http-wget-0.4.1 requires
transformers >=0.1.4.0 && <0.2
transformers-0.2.0.0 was excluded because transformers-0.1.4.0 was selected
instead
transformers-0.2.0.0 was excluded because authenticate-0.4.0.1 requires
transformers >=0.1.4.0 && <0.2
transformers-0.2.1.0 was excluded because http-wget-0.4.1 requires
transformers >=0.1.4.0 && <0.2
transformers-0.2.1.0 was excluded because transformers-0.1.4.0 was selected
instead
transformers-0.2.1.0 was excluded because authenticate-0.4.0.1 requires
transformers >=0.1.4.0 && <0.2
transformers-0.2.2.0 was excluded because http-wget-0.4.1 requires
transformers >=0.1.4.0 && <0.2
transformers-0.2.2.0 was excluded because transformers-0.1.4.0 was selected
instead
transformers-0.2.2.0 was excluded because authenticate-0.4.0.1 requires
transformers >=0.1.4.0 && <0.2