The version of tinker (tinker-6) in the portage tree cannot be merged anymore, because the source-package is no longer available for download. The latest version of tinker is 6.3.3, which is available for download on the project page.
+*tinker-7.1.2 (21 Jun 2015) + + 21 Jun 2015; Justin Lecher <jlec@gentoo.org> +files/7.1.2-openmp.patch, + +files/tinker-7.1.2-build.patch, +tinker-7.1.2.ebuild, -tinker-5.1.09.ebuild, + -tinker-6.ebuild: + Version Bump, bug #390165, bug #521292; drop old, obsolets bug #478596, bug + #552712 +