Installing problem in PHP-5.0.0RC2

hai,

i'm installing PHP5 that time it returns error msg,.. any body give
solution for this one...

[root@gopi1 php-5.0.0RC2]# ./configure
loading cache ./config.cache
.
.
.
.
checking for type of reentrant time-related functions... POSIX
checking for readdir_r... yes
checking for type of readdir_r... POSIX

General settings
checking whether to include debugging symbols... no
checking layout of installed files... PHP
checking path to configuration file... DEFAULT
checking directory to be scanned for configuration files... DEFAULT
checking whether to enable safe mode by default... no
checking for safe mode exec dir... /usr/local/php/bin
checking whether to enable PHP's own SIGCHLD handler... no
checking whether to enable magic quotes by default... no
checking whether to enable runpaths... yes
checking whether to explicitly link against libgcc... no
checking whether to enable short tags by default... yes
checking whether to enable dmalloc... no
checking whether to enable IPv6 support... yes
checking whether to enable versioning... no

Configuring extensions
checking whether to enable LIBXML support... yes
checking libxml2 install dir... no
configure: error: libxml2 version 2.5.10 or greater required.
[root@gopi1 php-5.0.0RC2]#