{ haskell
, compiler ? "ghc96"
, gf-pgf
, gf-core
, breakpointHook
}:

let
  src = "${gf-core.src}/src/runtime/haskell-bind";
  hpkgs = haskell.packages.${compiler};
  pkg = hpkgs.callCabal2nix "pgf2" src {
    # gf-pgf provides both libpgf and libgu.
    gu = gf-pgf;
  };
in haskell.lib.overrideCabal pkg (prev: {
  librarySystemDepends = (prev.librarySystemDepends or []) ++ [
    gf-pgf
  ];
})