self: super: {
  polite-merge = if builtins.hasAttr "polite-merge" super then
    super.polite-merge
  else
    self.callPackage ({ fetchgit, git, stdenv, }:
      stdenv.mkDerivation rec {
        pname = "polite-merge";
        version = "2.4.2";
        src = fetchgit {
          url = "https://git.scottworley.com/pub/git/polite-merge";
          rev = "v${version}";
          hash = "sha256-CUNKLCwIFwwVaA9opw9yql5AGej/ozQv8k1YR/cfV4I=";
        };
        postUnpack = "patchShebangs .";
        nativeCheckInputs = [ git ];
        doCheck = true;
        preInstall = "export prefix";
      }) { };
}