Red Hat Linux 6.2 appears to come with UCD SNMP 4.1.1; that version of UCD SNMP turned the function "snmp_set_full_objid()" into a macro. This means that any program that is linked dynamically with an earlier version of the UCD SNMP library, from earlier Red Hat Linux releases, and that calls "snmp_set_full_objid()" will fail to run on RH 6.2, as it will try to call "snmp_set_full_objid()" but will fail to find it in the shared library, as the shared library has the same version number as the UCD SNMP library in earlier versions of Red Hat Linux. This causes problems, for example, with the binary RPMs for Ethereal; they don't work on RH 6.2 (and versions built on 6.2 won't work on earlier versions of Red Hat Linux, as the macro "snmp_set_full_objid()" in UCD SNMP 4.1.1 calls a routine not present in earlier versions of UCD SNMP). The URL I'm entering for this bug points to the entry in the Ethereal FAQ for this problem (it's definitely a Question that's Frequently Asked on the Ethereal mailing lists). UCD SNMP 4.1.2 turns "snmp_set_full_objid()" (and some other routines) back into functions, so that it's binary compatible with older UCD SNMP libraries; future versions of Red Hat Linux should use UCD SNMP 4.1.2 or a later version if one comes out.
Red Hat 7.0 will include ucd-snmp-4.1.2. Thanks for the report.