anchor.diff: -{ stdenv, fetchurl, darwin }:
  +{ stdenv, fetchurl }:
   let
     version = "110.91";
     baseurl = "http://smlnj.cs.uchicago.edu/dist/working/${version}";
  
positive.code:     description = "Standard ML of New Jersey, a compiler";
      homepage    = http://smlnj.org;
      license     = licenses.bsd3;
      platforms   = [ "i686-linux" ] ++ platforms.darwin;
      maintainers = with maintainers; [ thoughtpolice ];
    };
  }
  
negative.code:   patchPhase = ''
      sed -i '/PATH=/d' config/_arch-n-opsys base/runtime/config/gen-posix-names.sh
      echo SRCARCHIVEURL="file:/$TMP" > config/srcarchiveurl
    '';
  
    unpackPhase = ''
      for s in $sources; do
  