anchor.diff: -{ lib, stdenv, fetchFromGitHub, cmake, libelf, libpcap }:
  +{ lib
  +, stdenv
  +, fetchFromGitHub
  +, cmake
  +, libelf
  +, libpcap
  +}:
   
   stdenv.mkDerivation rec {
     pname = "dynamips";
  
positive.code:     owner = "GNS3";
      repo = pname;
      rev = "v${version}";
      sha256 = "0pvdqs6kjz0x0wqb5f1k3r25dg82wssm7wz4psm0m6bxsvf5l0i5";
    };
  
    nativeBuildInputs = [ cmake ];
  
negative.code:   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.
      '';
      license = licenses.gpl2Plus;
      platforms = platforms.linux;
      maintainers = with maintainers; [ primeos ];
  