problems with DSO support

hi all I tried to install php-4.0.6 on my Red Hat 7.1 with apache_1.3.4+ssl_1.31 and mysql-3.23.39 but I've got a very big trouble: when I type: "./configure --with-mysql=/[path to mysql] --with-apxs=/[path to apxs]" I got: "Sorry, no shared object support for Apache available under your platform. Make sure the Apache module mod_so is compiled into your server binary `/usr/local/apache/bin/httpsd'. Sorry, I was not able to successfully run APXS. Possible reasons: ...... Apache was not compiled with DSO support (--enable-module=so)." This is the real problem. When a few years ago someone had installed apache, he "forgot" to "enable-module=so". Now I'm using this server with every particular configurations I put on it and I don't want to miss them. I shouldn't want to reinstall apache, only to "enable-module=so". Is it possible? is it possible to make an "upgrade"? Can anyone help me? best regards marco