{stdenv, fetchurl, ghc, perl, gmp, ncurses}:

stdenv.mkDerivation rec {
  version = "6.12.0.20091010";
  
  name = "ghc-${version}";
  
  homepage = "http://haskell.org/ghc";

  src = fetchurl {
    url = "http://darcs.haskell.org/~ghc/dist/6.12.1rc1/${name}-src.tar.bz2";
    sha256 = "903552917778329fc79cc273ece81030324006f47157ddd4278cb08c1c637fd3";
  };

  buildInputs = [ghc perl gmp ncurses];

  buildMK = ''
    libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-libraries="${gmp}/lib"
    libraries/integer-gmp_CONFIGURE_OPTS += --configure-option=--with-gmp-includes="${gmp}/include"
  '';

  preConfigure = ''
    echo "${buildMK}" > mk/build.mk
  '';

  configureFlags=[
    "--with-gcc=${stdenv.gcc}/bin/gcc"
  ];

  # required, because otherwise all symbols from HSffi.o are stripped, and
  # that in turn causes GHCi to abort
  stripDebugFlags=["-S" "--keep-file-symbols"];

  meta = {
    inherit homepage;
    description = "The Glasgow Haskell Compiler";
  };
}