anchor.diff:  
     buildInputs = [
       bzip2
  -    db
       expat
  +    lmdb
       mcpp
       openssl
     ];
  
positive.code: , fetchFromGitHub
  
  , bzip2
  , db
  , expat
  , mcpp
  , openssl
  }:
  
negative.code:     makeFlagsArray+=("prefix=$out")
    '';
  
    buildFlags = [
      "srcs"
    ];
  
    meta = with stdenv.lib; {
      description = "The internet communications engine";
      homepage = "http://www.zeroc.com/ice.html";
  