I add -std=c++11 to CXXFLAGS in my make.conf and net-print/cups-filters (all versions) doesn't compile with this. Adding "filter-flags -std=c++11" in src_configure() fixes the problem. Please consider changing the ebuild :)
see also: http://forums.gentoo.org/viewtopic-p-7661490.html?sid=388b93719294287357e1117adf302618
(In reply to igel from comment #0) > I add -std=c++11 to CXXFLAGS in my make.conf Don't.