Xonotic version 0.7 has been released: http://www.xonotic.org/2013/06/xonotic-0-7-release/ Reproducible: Always
renaming xonotic-0.6.0.ebuild -> xonotic-0.7.0.ebuild works fine builds and works without errors
added EBUILD keyword as the ebuild is available (renaming xonotic-0.6.0.ebuild -> xonotic-0.7.0.ebuild suffices)
in portage.