The ebuild assigns KEYWORDS="~*", which is invalid. I guess it was meant to read KEYWORDS="". Reproducible: Always
The dev who made bug 542728 has in fact already noted this but hasn't explicitly mentioned it in the list of others issues of net-misc/teamviewer-10.0.36281. That bug appears to have stalled mainly due to no reply from the proxy maintainer. I could mark this duplicate but on the technicality I cited here it doesn't properly qualify.
18 Jun 2015; NP-Hardass <NP-Hardass@gentoo.org> +files/teamviewer.init, +files/teamviewer.sh, +files/teamviewerd.conf, +files/teamviewerd9.init, +teamviewer-10.0.41499.ebuild, -files/teamviewer-10.0.36281-gentoo.patch, -files/teamviewer-9.0.30203-gentoo.patch, -teamviewer-10.0.36281.ebuild, files/teamviewerd.init, metadata.xml, teamviewer-9.0.32150.ebuild: Version bump to 10.0.41499 and drop 10.0.36281. Resolves bug #544222 and #542728