[PHP-INSTALL] PHP 5.1 Compile error with IMAP Client 2004g

I'm trying to upgrade to PHP 5.1 but am having trouble compiling it with the IMAP extension. I have the UW IMAP library installed, version 2004g, which works fine with PHP 5.0. At the linking stage, I get: Text relocation remains referenced against symbol

[PHP-INSTALL] problem with libphp5.so

I followed the instruction of php5.1.1 to install my webserver. currently i have Apache 2.0.55 PHP5.1.1 Mysql 4.1 the problem is that the module won't load. it give me a zend error Syntax error on line 232 of /usr/local/apache2/conf/httpd.conf: Cannot load /usr/local/apache2/modules/libphp5.so