anchor.diff:  
     nativeBuildInputs = [
       cmake
  -    gcc5
  +    gcc
       pkgconfig
     ];
   
  
positive.code: { stdenv, fetchgit, curl, cmake, boost, gcc5, protobuf, pkgconfig, jsoncpp
  , libusb1, libmicrohttpd
  }:
  
  let
    version = "1.2.0";
  in
  
  stdenv.mkDerivation rec {
  
negative.code:   src = fetchgit {
      url    = "https://github.com/trezor/trezord";
      rev    = "refs/tags/v${version}";
      sha256 = "1iaxmwyidjdcrc6jg0859v6v5x3qnz5b0p78pq0bypvmgyijhpm4";
    };
  
    meta = with stdenv.lib; {
  