Loading the apache module

[maochunj@cn.ibm.com]

Hi,
    I have made an apache module. It works fine on Apache1-3-6. After
recompiling with the header files provided by Apache1-3-12, it does not
work.
When I add my module to the Apache1-3-12,  the parent process can strat up,
but it can not fork the child process to serve the request form outside.
   Is there any difference between Apache1-3-6 and Apache 1-3-12? Do I need
any special handling in migration my plug-in module from Apache1-3-6 to
Apache1-3-12?
   The OS used by me is RedHat6.2. I have tried it in RedHat6.1. The same
issue.
   My plug-in module is written by C++ language.

  Who knows this? Give me ant hints or URL or reference material.