problem adding reverse proxy to Apache 2.2.0

Hello,

I'm having trouble installing the necessary modules to use apache 2.2.0
as a reverse proxy.

First of all, httpd -l lists mod_so as installed, the modules directory
already contained mod_proxy, mod_proxy_connect, mod_proxy_ftp, and
mod_proxy_http shared objects.

Adding LoadModule directives for mod_proxy and mod_proxy_connect and
running apachectl configtest, led to unresolved symbols.
apr_connect is undefined in mod_proxy.so
apr_poll_socket_add is undefined in mod_proxy_connect

I'm trying to recompile and add theses modules manually or with
apxs tool but I'm still getting these unresolved symbols.

Any idea of what is going wrong ?

Thanks for your help.

Emmanuel.
remove 'NO' twice in my email address.