*** setup configure

Configuring cpython-3.1.0...
Dependency base ==4.*: using base-4.2.0.2
Dependency bytestring -any: using bytestring-0.9.1.7
Dependency text -any: using text-0.8.0.0
cabal-setup: The pkg-config package python-3.1 is required but it could not be
found.

*** Trying again with preferred-versions

*** setup configure

Configuring cpython-3.1.0...
cabal-setup: At least the following dependencies are missing:
base >=4 && <5 && <4