final: prev: rec {
  gawk_mpfr = prev.gawk.overrideAttrs (prevAttrs: {
    # https://www.gnu.org/software/gawk/manual/html_node/Compiling-with-MPFR.html
    buildInputs = prevAttrs.nativeBuildInputs ++ [ final.mpfr final.gmp ];
  });
}