http://rpmfind.net/linux/RPM/libxml2.html
but aslo u need devel:
http://rpmfind.net/linux/RPM/libxml2-devel.html
and about compiling:
also u need zlib (and devel) => 1.0.9 (from RedHat for example)
and last:
when u'll try to compile it all together, u'll probably recieve compilation error like this:
cheking gzgets in zlib: no
try to create symbolic link
/usr/lib/libxml.so -> libxml2.so.2.3.0
/usr/lib/libxml.so.2 -> libxml2.so.2.3.0
(!) i've spend whole weekend solving this issue...
PS. myconf:
./configure --prefix=/usr/local/php --with-zlib=/usr --with-dom=/usr ...