nixpkgs/pkgs/development/compilers/ghcjs/shims.nix

{ fetchFromGitHub }:
fetchFromGitHub {
  owner = "ghcjs";
  repo = "shims";
  rev = "b97015229c58eeab7c1d0bb575794b14a9f6efca";
  sha256 = "1p5adkqvmb1gsv9hnn3if0rdpnaq3v9a1zkfdy282yw05jaaaggz";
}