I am also getting simillar error while installing from RPM binary.
I am installing zcs-5.0.8_GA_2462.F7.20080709160843.tgz on fedora 9 (Sulphur).

Here is the error.

Error: assertion '-r /opt/zimbra/conf/my.cnf' failed
perl: symbol lookup error: /opt/zimbra/zimbramon/lib/i386-linux-thread-multi/auto/IO/IO.so: undefined symbol: Perl_Tstack_sp_ptr

Will be very thankfull if anybody put any reply.