no zlib from zlib.net

[Tito Mari Francis Escaño]

Good day,
I'm planning to experiment modifying FirefoxOS to be based on OpenBSD
instead of the default Linux kernel, and it seems we don't have the
corresponding zlib from www.zlib.net. I checked on Ubuntu and they use
zlib 1.2.8, this is the latest version as per zlib homepage. Can
somebody please advise me on this?
Thanks.