anchor.diff:      proprietary_codecs = false;
       use_gnome_keyring = gnomeKeyringSupport;
       disable_nacl = !naclSupport;
  -    use_openssl = true;
  +    use_openssl = useOpenSSL;
       selinux = useSELinux;
       use_cups = false;
     } // stdenv.lib.optionalAttrs (stdenv.system == "x86_64-linux") {
  
positive.code: 
  , useSELinux ? false
  , naclSupport ? false
  , gnomeKeyringSupport ? false
  , useProprietaryCodecs ? false
  }:
  
negative.code:     which makeWrapper
      python perl pkgconfig
      nspr udev
      (if useOpenSSL then openssl else nss)
      utillinux alsaLib
      gcc bison gperf
      krb5
  