A newbie question

Hi, list. I'm a newbie in UNIX, so this might be a stupid question. Anyway, I've installed php-4.3.1 as a loadable module for apache-1.3.27. (apache configured: ./configure --enable-so; php configured: ./configure --with-apxs=/usr/local/apache/bin/apxs --with-mysql). Installation of both goes fine. Then I copy php.ini-dist to /usr/local/lib/php.ini. After that I've modified httpd.conf: AddType Application/x-httpd-php .php. I didn't modify anything else. Apache starts ok, but when I try to execute some php script, it gives me "Internal server error 500". I use FreeBSD-4.6.2. Please, tell me what am I doing wrong.