Trouble with php_mapscript

[Abe Gillespie]

I'm getting Warning: dl(): Unable to load dynamic library
'/usr/local/lib/php/extensions/php_mapscript.so' - libgdal.so.1:
cannot open shared object file: No such file or directory in
/var/www/index.php on line 4

It's a fresh install with all the latest versions of libraries. 
libgdal.so.1 lives in /usr/local/lib.  Is there a path I can set
somewhere so that PHP / MapScript can find it?

Thanks.
-Abe