Merge pull request #206238 from collares/lean-3.50.0

stdenv.mkDerivation rec {

  pname = "lean";

  version = "3.49.0";

  version = "3.50.3";

  src = fetchFromGitHub {

    owner  = "leanprover-community";

    # from. this is then used to check whether an olean file should be

    # rebuilt. don't use a tag as rev because this will get replaced into

    # src/githash.h.in in preConfigure.

    rev    = "acf633e01a8783a12060b0a1b7b5b5e15fd73e77";

    sha256 = "sha256-KF13DlGEl6aICSp/haczo54gjLZaOxyzFRdzvyyiu5M=";

    rev    = "855e5b74e3a52a40552e8f067169d747d48743fd";

    sha256 = "sha256-RH4w7PpzC+fhqCHikXQO2pUUvWD2qrA0mVMUGxpauwE=";

  };

  nativeBuildInputs = [ cmake ];