samba - Feb 2012 - samba-3.6.0 .spec anad patches for SRPM building for RHEL 5 and 6 at https://github.com/nkadel/samba-3.6.0-srpm

For folks who want samba-3.6.0 for RHEL 5 or 6, and would prefer to
have RHEL compatible layouts rather than the somewhat different
layouts of the packages at
http://ftp.samba.org/pub/samba/Binary_Packages/, I've published some
.spec files and patches at

    https://github.com/nkadel/samba-3.6.0-srpm

I'm happy to walk through how to build these with "mock" to get
very
clean packages for your particular distribution. They're backported
from the samba-3.6.0 for Fedora, and compile and pass at least testing
on RHEL 5 and RHEL 6 with i386 and x86_64 environments. I personally
use them for CIFS 2.x testing.