anchor.diff:  
     outputs = [ "out" "man" "doc" ];
   
  -  buildInputs = [ bind libseccomp zlib openssl ];
  +  buildInputs = [ bind zlib openssl ]
  +              ++ stdenv.lib.optional stdenv.isLinux [ libcap libseccomp ];
   
     postInstall = ''
       mkdir -p "$out/share/doc/"
  
positive.code:     maintainers = [ maintainers.vcunat ];
    };
  }
  
  
negative.code: { stdenv, fetchurl, bind, libseccomp, zlib, openssl, libcap }:
  
  stdenv.mkDerivation rec {
    name = "dnsperf-${version}";
  