Can't override TLS_REQCERT

I found the previous post of someone else who faced the same problem I'm encountering, but I did not see a posted solution:

http://www.openldap.org/lists/openldap-technical/201310/msg00084.html

In /etc/openldap/ldap.conf, TLS_REQCERT is set to 'allow'.

I would like to leave this setting, but override it for a specific invocation of ldapsearch. I have attempted to do so by setting TLS_REQCERT in ~/.ldaprc and be setting the LDAPTLS_REQCERT environment variable. Neither has worked.

Interestingly, I _HAVE_ found that I can override TLS_CACERTDIR in either of those locations.

Is this a bug?

Andy