Compile dynamic library for PHP.

[Anon]

Dear all developer!
I want to compile some dinamic library for PHP (eg: imap.so, mysql.so, ldap.so...) But I don't known how to do. Anyone can give me some instruction.
These are some information of my system:
OS: Redhat linux 7.1
Apache server: 1.3.22
PHP: php-4.0.6.tar.gz

Thanks for any help!