Resolving dependencies...
Downloading  unix-2.8.7.0
Downloaded   unix-2.8.7.0
Configuring unix-2.8.7.0...
Error: cabal: The package has a './configure' script. If you are on Windows,
This requires a Unix compatibility toolchain such as MinGW+MSYS or Cygwin. If
you are not on Windows, ensure that an 'sh' command is discoverable in your
path.

Failed to install unix-2.8.7.0
Error: cabal: Some packages failed to install:
unix-2.8.7.0-C0JAG9UNIaxIZcJeAetdLj failed during the configure step. The
exception was:
ExitFailure 1