Zend Optimizer don't work

After ./build zend on FreeBSD:

# /usr/local/etc/rc.d/httpd restart
Stopping httpd: [ OK ]
Starting httpd: [ OK ]
Press any key to continue...
[Wed Sep 29 22:56:07 2004] [warn] Loaded DSO modules/mod_fastcgi.so uses plain Apache 1.3 API, this module might crash under EAPI! (please recompile it with -DEAPI)
shmget() failed: Invalid argument
Failed to start up concurrent users module!

How to fix?

What version of php are you using? You may want to try recompiling everything

cd /usr/local/directadmin/customapache
./build clean
rm -f configure.*
./build update
./build all

and be sure to click yes to recompile programs that have already been compiled such as GD.