I am trying to build an apache module for SCL apache version (httpd24-httpd) . I have located documentation on how to proceed with building SCL package from scratch, however I didn't come across any information on building atop of existing packages, like in my case. Any pointers (URLs etc.) will be deeply appreciated.
Some apache modules already exists in centos-sclo repository:
This can be a good starting point, diffing with base package in Fedora / EPEL.
Notice: I think the same question have been raised on scl.org mailing list, which is probably a better place for SCL related questions.