Komplotan rahasia gagal menginstal unix-2.7.0.0

Saya mencoba menginstal paket unix di lingkungan windows. Saya menggunakan Cygwin, tetapi masih tidak berfungsi.

Di bawah ini cuplikan kesalahan yang saya dapatkan:

$ cabal install unix
Resolving dependencies...
Configuring unix-2.7.0.0...
Warning: Unknown extensions: CApiFFI, InterruptibleFFI
configure: WARNING: unrecognized options: --with-compiler, --with-gcc
checking for gcc... gcc
.
.
.
configure: creating ./config.status
config.status: creating unix.buildinfo
config.status: creating include/HsUnixConfig.h
configure: WARNING: unrecognized options: --with-compiler, --with-gcc
cabal.exe: Package unix-2.7.0.0 can't be built on this system.
Failed to install unix-2.7.0.0
cabal.exe: Error: some packages failed to install:
unix-2.7.0.0 failed during the building phase. The exception was:
ExitFailure 1