Forum OpenACS Q&A: Response to mod_aolserver module might crash under EAPI

Petru's suggestion to ad -DEAPI is a good one; however, there is
more you can do to diagnose this.

1) Run "apachectl configtest" and see if the syntax of your
httpd.conf file is ok.

2)Look at the error_log for more detailed information.  My guess
is that you are running on a platform that requires you to run
"ldconfig" whenever you add additional libraries to the system.

Did you just install Postgres?  If so, you linked against the PG
libraries; if you did not re-run ldconfig and add the PG libs to the
ld.so cache, then starting Apache will fail.