cruchot ~ # time eix-sync 
 * Running emerge --sync ...
--- Invalid atom in /usr/portage/profiles/package.mask: >>>>>>> 1.5723
--- Invalid atom in /usr/portage/profiles/package.mask: =======
--- Invalid atom in /usr/portage/profiles/package.mask: <<<<<<< package.mask
--- Invalid atom in /usr/portage/profiles/package.mask: >>>>>>> 1.5723
--- Invalid atom in /usr/portage/profiles/package.mask: =======
--- Invalid atom in /usr/portage/profiles/package.mask: <<<<<<< package.mask                                                                     [ ok ]
 * Running update-eix ...
-- Invalid line in /usr/portage/profiles/package.mask: "<<<<<<< package.mask"
   Can't read category.
-- Invalid line in /usr/portage/profiles/package.mask: "======="
   Can't read category.
-- Invalid line in /usr/portage/profiles/package.mask: ">>>>>>> 1.5723"
   Can't read category.                                                                                                                          [ ok ]
Diffing databases (11252 - 11256 packages)

[...]