subj. Please build it.
Last time I checked the version of libevent in RH4 was too old to build memcached with.
RH4 or EL4? EL4 EPEL has libevent 1.1b
memcached-1.2.8-1.el4 has been submitted as an update for Fedora EPEL 4. http://admin.fedoraproject.org/updates/memcached-1.2.8-1.el4
memcached-1.2.8-1.el4 has been pushed to the Fedora EPEL 4 testing repository. If problems still persist, please make note of it in this bug report. If you want to test the update, you can install it with su -c 'yum --enablerepo=updates-testing update memcached'. You can provide feedback for this update here: http://admin.fedoraproject.org/updates/EL-4/FEDORA-EPEL-2009-0118
memcached-1.2.8-1.el4 has been pushed to the Fedora EPEL 4 stable repository. If problems still persist, please make note of it in this bug report.