anchor.diff:      libtool autoconf automake makeWrapper
     ];
     propagatedBuildInputs = [
  -    libffi gmp mpfr
  +    libffi gmp mpfr gcc
     ];
   in
   stdenv.mkDerivation {
  
positive.code: {stdenv, fetchurl
  , libtool, autoconf, automake
  , gmp, mpfr, libffi, makeWrapper
  , noUnicode ? false, 
  }:
  let
    s = # Generated upstream information
  
negative.code:   postInstall = ''
      sed -e 's/@[-a-zA-Z_]*@//g' -i $out/bin/ecl-config
      wrapProgram "$out/bin/ecl" \
        --prefix PATH ':' "${gcc}/bin" \
        --prefix NIX_LDFLAGS ' ' "-L${gmp.lib or gmp.out or gmp}/lib" \
        --prefix NIX_LDFLAGS ' ' "-L${libffi.lib or libffi.out or libffi}/lib"
    '';
  