POST superglobal is empty

Does anyone have any ideas as to why $_POST would be empty when submitting a form to php? I am running PHP5 as CGI in apache 1.3.22 on redhat linux. I've also tried php4.3.8 CGI (same php configuration and .ini file) and I get the same behavior. When I submit an html form with method=post, the $_POST superglobal array is empty. GET works fine. I've tried many different configuration options with PHP but none seem to help. I've tried the default php.ini-dist config file with no luck. I've gone through all the relevant bug reports and search all the mailing lists, FAQ's and newsgroups. I can't find any useful, applicable information. My configure command is: ./configure \ --prefix=/usr/local/php/php5.0.0 \ --with-config-file-path=/usr/local/php/php5.0.0/ \ --with-config-file=/usr/local/php/php5.0.0/php.ini \ --enable-force-cgi-redirect \ --disable-path-info-check \ --enable-safe-mode \ --disable-short-tags \ --with-regex=system \ --with-mysql \ --enable-debug \ --with-mcrypt \ --enable-versioning \ --disable-libxml -- Andy