Hello!

Kei noticed that the latest GHC package does not work:

$ guix environment --pure --ad-hoc ghc
[env]$ ghc --help
/gnu/store/50gn6ahfc0llldy6ggrnj1hc5wsxyfh9-ghc-8.0.1/lib/ghc-8.0.1/bin/ghc: error while loading shared libraries: libncursesw.so.6: cannot open shared object file: No such file or directory

ghc@7 (the default for Haskell packages) does not have this problem.