anchor.diff:    cmakeFlags = [ "-DDYNAMIPS_CODE=stable" ];
   
     meta = with lib; {
  +    inherit (src.meta) homepage;
       description = "A Cisco router emulator";
       longDescription = ''
         Dynamips is an emulator computer program that was written to emulate Cisco
         routers.
       '';
  -    inherit (src.meta) homepage;
       license = licenses.gpl2Plus;
       platforms = platforms.linux;
       maintainers = with maintainers; [ primeos ];
  
positive.code: { lib, stdenv, fetchFromGitHub, cmake, libelf, libpcap }:
  
  stdenv.mkDerivation rec {
    pname = "dynamips";
  
negative.code:     owner = "GNS3";
      repo = pname;
      rev = "v${version}";
      hash = "sha256-JQJa3NZ9mQqqvuTzU7XmAr1WRB4zuLIwBx18OY3GbV8=";
    };
  
    nativeBuildInputs = [ cmake ];
  