anchor.diff:  
     enableParallelBuilding = true;
   
  +  passthru.tests.version = testers.testVersion {
  +    package = tracebox;
  +    command = "tracebox -V";
  +  };
  +
     meta = with lib; {
       homepage = "http://www.tracebox.org/";
       description = "A middlebox detection tool";
  
positive.code:     json_c
    ];
  
    configureFlags = [
      "--with-lua=yes"
      "--with-libpcap=yes"
  
negative.code: , libpcap
  , lua5_1
  , json_c
  , testers
  , tracebox
  }:
  stdenv.mkDerivation rec {
    pname = "tracebox";
  