{ mkDerivation, base, directory, fetchurl, filepath }:
mkDerivation {
  pname = "hsinstall";
  version = "1.6";
  src = fetchurl {
    url = "http://example.org/";
    sha256 = "abc";
  };
  isLibrary = true;
  isExecutable = true;
  enableSeparateDataOutput = true;
  libraryHaskellDepends = [ base directory filepath ];
  executableHaskellDepends = [ base directory filepath ];
  description = "Install Haskell software";
  license = stdenv.lib.licenses.isc;
}