anchor.diff: -{ stdenv, lib, fetchFromGitHub, mcpp, bzip2, expat, openssl, lmdb
  +{ stdenv, lib, fetchFromGitHub, bzip2, expat, openssl, lmdb
   , darwin, libiconv, Security
   , cpp11 ? false
   }:
   
   let
  -  zeroc_mcpp = mcpp.overrideAttrs (self: rec {
  +  zeroc_mcpp = stdenv.mkDerivation rec {
       pname = "zeroc-mcpp";
       version = "2.7.2.14";
   
  
positive.code:   '';
  
    meta = with stdenv.lib; {
      homepage = "http://www.zeroc.com/ice.html";
      description = "The internet communications engine";
      license = licenses.gpl2;
      platforms = platforms.unix;
  
negative.code:       sha256 = "1psryc2ql1cp91xd3f8jz84mdaqvwzkdq2pr96nwn03ds4cd88wh";
      };
  
      configureFlags = [ "--enable-mcpplib" ];
      installFlags = [ "PREFIX=$(out)" ];
    };
  
  in stdenv.mkDerivation rec {
    pname = "zeroc-ice";
  