samba - Oct 2010 - Working from RHEL 5 SRPM's to build samba-3.6.0pre1 chokes on 'make pch'

I'm trying to get a clean RPM built for samba-3.6.0pre1, to tets out
CIFS 2. The old RHEL SRPM's do a 'make pch' command that barfs hard
on
samba-3.6.0pre1. Is this a command that is no longer appropriate or
necessary on this version of Samba? Does it have any genuine use?