If these variables are not set to the specified values when you
attempt to uninstall WebSphere MQ V 5.3, it can cause unrecoverable
damage to the RPM database. This is due to a known Linux issue, see https://rhn.redhat.com/errata/RHEA-2004-010.html
for more information.
WebSphere MQ
for Linux (x86
platform), Version 6.0 is not affected by this issue. When you have completed
your migration to WebSphere MQ Version 6.0, unset these
variables to take advantage of the performance benefits of the Native Linux Posix
Thread Library (NPTL).