Help compiling Dynamically Linked Module

I am trying to compile and run the tutorial, from the php documentation, on extending php. I am currently working in SunOS v5.7 with gcc version 2.95 19990728. I am running PHP 4.2.0 statically in Apache 1.3.24 I have copied the first_module.c file and I can compile it with the following command ~~~/php-4.2.0/ext> gcc -fpic -DCOMPILE_DL=1 -I/usr/local/include -I../main -I../TSRM -I. -I.. -I../Zend -c -o first_module/first_module.o first_module/first_module.c I can also link with the following command ~~~/php-4.2.0/ext>gcc -shared -L/usr/local/lib -dynamic -o first_module/first_module.so first_module/first_module.o I then copy this module to the working directory of my php script and call it like this: <? dl("first_module.so"); $param = 2; $return = first_module($param); print("We sent '$param' and got '$return'"); ?> the file has execute and read permissions set for all users. the file is located by php, but I get this error: Warning: Invalid library (maybe not a PHP library) 'first_module.so' in /export/home/jlang/htdocs/phpscript/modtest.php on line 5 can anyone help me find out why this file is not correctly loading Thanks, Jeff Lang