build against internal zlib for now. With system zlib we get errors
for ports -u:
Updating file list from crux.nu::ports/crux-3.0/core/
This rsync lacks old-style --compress due to its external zlib. Try -zz.
Continuing without compression.
Looks like upstream has modified the bundled zlib to do misc magic.
Juergen Daubert
9bcb9c3899