The configuration and make process fails to find mib.h when ucd-snmp is install in the default location of
/usr/local.  In particular the configuration looks every where BUT /usr/local/include/ucd-snmp for the 
necessary headers. 

The simple work around of course is to add a symbolic link:

cd /usr/local/include
ln -s ucd-snmp snmp

and/or then specify:

--with-snmp=/usr/local

But thats nusance to remember late at night, especially for a module that goes out of its way to include every
thing and the kitchen sink (one might think it was Perl).