mesa and xf86-video-ati git problem

[Beso]

i have a problem installing mesa and xf86-video-ati from the live ebuilds on
gentoo for the following reason:
the git repos can be cloned with git-clone but cannot be checkouted with
git-checkout, which it what the ebuild git calls before doing a git-clone.
what can i do to fix this issue?

-- 
dott. ing. beso
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