Dependency on rpmlib

["Andrea Sciaba'" <Andrea Sciaba cern ch>]

Hello,
I am building some rpms using version 3.0.5, and I have found out that 
if I specify explicitly a particular version of a required package in 
the Prereq: tag, like for example:

Prereq: anaphe-cms = 3.6.6

the rpm is built with this dependency:

rpmlib(VersionedDependencies) <= 3.0.3-1

while if I use

Prereq: anaphe-cms

that dependency is not there.

Can anybody explain it?

Thanks,
Andrea Sciaba'