GHC's ./configure script should check for ncurses

[thoughtpolice]

When building GHC, the configure script will not check for ncurses, even though it is required for the build of terminfo. Without it installed, the build fails mid-way in with:

checking for stdint.h... yes
checking for unistd.h... yes
checking ncurses.h usability... no
checking ncurses.h presence... no
checking for ncurses.h... no
checking curses.h usability... no
checking curses.h presence... no
checking for curses.h... no
configure: error: in `/home/linaro/code/ghc/libraries/terminfo':
configure: error: curses headers could not be found, so this package cannot be built
See `config.log' for more details

I think that configure should check for ncurses immediately so you don't accidentally lack a dependency. It's just annoying.

[igloo]

Unfortunately, with the way the build works, I don't think there's a cure that's better than the disease, so I'm going to close this as wontfix.