anchor.diff:      stdenv.lib.optional stdenv.isDarwin ./darwin-openssl-linking-fix.patch;
   
     buildInputs = [ openssl libtool perl libxml2 ] ++
  -    stdenv.lib.optional stdenv.isLinux libseccomp;
  +    stdenv.lib.optional enableSeccomp libseccomp;
   
     STD_CDEFINES = [ "-DDIG_SIGCHASE=1" ]; # support +sigchase
   
  
positive.code: { stdenv, lib, fetchurl, openssl, libtool, perl, libxml2
  , libseccomp ? null }:
  
  let version = "9.10.4-P6"; in
  
  
negative.code:     "--without-pkcs11"
      "--without-purify"
      "--without-python"
    ] ++ lib.optional enableSeccomp "--enable-seccomp";
  
    postInstall = ''
      moveToOutput bin/bind9-config $dev
  