GNU gzip doesn't have an --rsyncable option, so I'm afraid you'll need
to send this to the maintainer of the patched version you're using.
- bug#17698: [PATCH] gzip: --rsyncable missing in gzip.1 man pag... jchaloup
- bug#17698: [PATCH] gzip: --rsyncable missing in gzip.1 ma... Paul Eggert