how to make "shared library cache" (ldconfig cache) changes permanent?

[Chad Leigh -- Shire.Net LLC]

I have a new directory I want to be always used to look for shared 
libraries.

I do a

% ldconfig -m /usr/public/lib

and all is well.  However, on reboot, the changes go away and I have to 
do it again.  Does not work so well if things that start up at boot 
time rely on libraries in the new directory.

How can I execute this so it is a permanent addition?

Thanks
Chad