php with xml support

Hi everybody I'm tryng to install php with xml support on redhat 9.0a. I downloaded the source of php 4.3.4 version. I used the following configure command: ./configure --prefix=/usr --libdir=/usr/share/lib --includedir=/usr/include --with-openssl-dir=/usr/bin/openssl --with-curl-dir=/usr/bin/curl --with- dom --with-zlib --enable-ftp --with-gettext --with-mysql --with-pear -- with-mysql Anything goes smoothly. I give the "make" and "make install" commands, and everything's ok, i can see a "dom xml support yes" message. When i try to open a php page with xml functions i get a "call to undefined function domxml_openfile()" error. It seems the domxml header functions can't be found. Any suggestions? thanks in advance Emanuele