Branching libevent for EL-4

[Ruben Kerkhof <ruben rubenkerkhof com>]

Hi list,

I'm planning to build libevent for EL-4.
RHEL 5 has libevent-1.1a-3.21 (without disttag).

What would be the best version to build to ensure a safe upgrade path  
from EL-4 to EPEL-5?
Would version 1.1a, release 1%{?dist} work?

Thanks,

Ruben