If you intend to create a new DSO module, make sure you have the httpd-devel package installed. To do so, type the following at a shell prompt:

~]# yum install httpd-devel

This package contains the include files, the header files, and the APache eXtenSion (apxs) utility required to compile a module.

Once written, you can build the module with the following command:

~]# apxs -i -a -c module_name.c

If the build was successful, you should be able to load the module the same way as any other module that is distributed with the Apache HTTP Server.