DOM libxml help. Please =-)

[Anon]

I'm trying to compile php with DOM support. Everything is honky wonderful until this pops up during the compile;

/bin/sh /usr/src/php-4.0.6/libtool --silent --mode=link gcc -I. -I/usr/src/php-4.0.6/ -I/usr/src/php-4.0.6/main -I/usr/src/php-4.0.6 -I/usr/src/php-4.0.6/Zend -I/usr/src/libxml2-2.4.6//include -I/usr/src/php-4.0.6/ext/mysql/libmysql -I/usr/src/php-4.0.6/ext/xml/expat/xmltok -I/usr/src/php-4.0.6/ext/xml/expat/xmlparse -I/usr/src/php-4.0.6/TSRM -DSUPPORT_UTF8 -DXML_BYTE_ORDER=12 -g -O2 -o php -export-dynamic stub.lo libphp4.la
.libs/libphp4.a(php_domxml.o): In function `php_xpathptr_new_context':
/usr/src/php-4.0.6/ext/domxml/php_domxml.c:1607: undefined reference to `xmlXPtrNewContext'
.libs/libphp4.a(php_domxml.o): In function `php_xpathptr_eval':
/usr/src/php-4.0.6/ext/domxml/php_domxml.c:1670: undefined reference to `xmlXPtrEval'
collect2: ld returned 1 exit status
make[1]: *** [php] Error 1
make[1]: Leaving directory `/usr/src/php-4.0.6'
make: *** [all-recursive] Error 1
root@squeegie:/usr/src/php-4.0.6#

any ideas?