{ haskell
, haskellPackages
, stdenv
, fetchFromGitHub
, gf-pgf
, applyPatches
}:

let
  version = "3.12";
  src = applyPatches rec {
    src = fetchFromGitHub {
      owner = "GrammaticalFramework";
      repo = "gf-core";
      rev = "release-${version}";
      hash = "sha256-9sB8tt2eOJT43kv2eaUYRQCzyBZOp6HvJdgGJQgiqks=";
    };
    patches = [
      "${src}/nix/expose-all.patch"
      "${src}/nix/revert-new-cabal-madness.patch"
      ./fix-cabal-syntax-error.patch
    ];
  };
  pkg = haskellPackages.callCabal2nixWithOptions "gf" src "--flag=-server" {};
in haskell.lib.overrideCabal pkg (prev: {
  jailbreak = true;
  configureFlags = [ "-f" "c-runtime" ];
  librarySystemDepends = [ gf-pgf ];
})