build.log snippets: Makefile:6905: recipe for target 'inkview' failed Makefile:6901: recipe for target 'inkscape' failed /usr/lib/gcc/x86_64-pc-linux-gnu/5.3.0/../../../../lib64/libgtkmm-2.4.so: undefined reference to `Glib::ustring::ustring(std::string const&)' My guess this bug is related to: Bug 566328 - (libsigc++-2.6) [TRACKER] dev-libs/libsigc++-2.6 breakage Reproducible: Always
It looks like this was happening before: https://forums.gentoo.org/viewtopic-t-1017098-view-previous.html?sid=697af65c4435be35cadb52df40f72c7d If I don't misremember people will need to rebuild world when updating to gcc5
Have you tried the instructions in the news item - https://gitweb.gentoo.org/data/gentoo-news.git/plain/2015-10-22-gcc-5-new-c++11-abi/2015-10-22-gcc-5-new-c++11-abi.en.txt? Please reopen if problems persist.
Same error even after revdep-rebuild