XML with PHP4

Hy everybody

I hope someone can help me with my problem

i installed PHP on an Apache via RPM but without XML

Now i need the XML-Part

This looked like the best way to do this : I translated a new version of
php4

my Configure_File

configure --prefix=PATH/php4 --exec-prefix=PATH/php4 --bindir=PATH/php4/bin
--sbindir=PATH/php4/sbin --libexecdir=PATH/php4/libexec --datadir=PATH/php4/
share --sysconfdir=PATH/php4/etc --sharedstatedir=PATH/php4/com --localstate
dir=PATH/php4/var --libdir=PATH/php4/lib --includedir=PATH/php4/include --in
fodir=PATH/php4/info --mandir=PATH/php4/man --program-suffix=php --enable-FE
ATURE --with-PACKAGE --enable-safe-mode --with-exec-dir=PATH/php/bin --enabl
e-track-vars --enable-magic-quotes --disable-pear --with-mod_charset --enabl
e-discard-path --with-filepro --with-ftp --without-gd --with-hyperwave --ena
ble-sysvsem --enable-sysvshm --enable-wddx --enable-xml --enable-versioning
--with-regex=apache  --with-apache=/home/httpd.

finally there is a dir called PHP4
a subdir BIN with a PHP file


as soon as i open a file  (test.php) with XML_PARSER_CREATE() ::
Fatal error: Call to undefined function: xml_parser_create() in
PATH/php4/test.php

????????????????????????????????????????????
Where is my problem
????????????????????????????????????????????

Thanxs for helping
Andy