Since this isn't a bug, I am brining it up here:
The 389-ds wants apache to run with the mpm_worker_module.
Apache-2.4 provides now this module as stabel

When I do this (using mpm-worker I get this error:
Apache is running a threaded MPM, but your PHP Module is not compiled to be threadsafe.  You need to
recompile PHP
I am not quite sure how to proceed. What would be the disadvantage of compiling PHP threadsafe?

--
Best regards
Thomas Spuhler