Additionally, include one of the following options:
--with-apxs=pathtoapxs (if you use apache-1.3.x and apache is already installed)
--with-apxs2=pathtoapxs2 (if you use apache-2.x and apache is already installed)
--with-apache (if you want to compile apache from sources, too)
Examples:
--with-apache=../apache_1.3.27
--with-apxs=/usr/sbin/apxs
--with-apxs2=/usr/sbin/apxs
sometimes apxs of apache 2 has the name apxs2 (e.g. SuSE 8.2, it depends on how apache has been compiled)
T.