[PHP-INSTALL] Question about gd.so and PHP

[Jake Bottero]

I have php4 installed.
From the command line, if I type "php", it tells me:

   PHP Warning: PHP Startup: Unable to load dynamic library './gd.so' - 
./gd.so: Cannot open shared object file: No such file or directory in 
Unknown on line 0

I understand what it is saying, but I don't understand what it means. I 
use gd is several simple php scripts I experiment with, so I know it 
functions someplace.