doxygen191 = pkgs.doxygen.overrideAttrs (_: rec {
name = "doxygen-1.9.1";
src = pkgs.fetchurl {
  urls = [
    "mirror://sourceforge/doxygen/${name}.src.tar.gz" # faster, with https, etc.
    "http://doxygen.nl/files/${name}.src.tar.gz"
  ];
  sha256 = "1lcif1qi20gf04qyjrx7x367669g17vz2ilgi4cmamp1whdsxbk7";
};
});