[gentoo/fbsd] Problem emerging libperl

[welele]

I start testing gentoo/fbsd in a virtual vmware computer yesterday. I have trouble emerging libperl (inside the emerge system).
I just follow the Documentation on installing Gentoo/fbsd, partition, then untar the experimental stage and the portage alt overlay, and then launch a emerge system. It fail with a "Digest verification failed, size don't match". I made a new digest with the file perl-5.8.8.tar.bz2 from a ftp distfile with the ebuild program (the md5sum of this file is the same that this from the original digest).
Now emerge try to compile, but fail with "try to erase file from other package". I don't know what to do. Is anybody have an idea? Please help me.

[kaktyc]

Try to disable collision-protect in FEATURES.