Updating Gentoo Linux box is failing due to dependency
What do I need to change to fix this problem?
$ sudo emerge --update --deep --newuse world
Calculating dependencies... done!
emerge: there are no ebuilds built with USE flags to satisfy "dev-lang/python[xml]".
!!! One of the following packages is required to complete your request:
- dev-lang/python-2.5.4-r3 (Change USE: +xml)
(dependency required by "app-portage/gentoolkit-0.2.4.5" [ebuild])
(dependency required by "world" [argument])
Thanks in advance.