see $SUMMARY Will attach build.log in the morning
Created attachment 166472 [details] build.log
Fixed in 2.12.7 and 2.12.1 (though that one doesn't build elsewhere with gcc4.3). Now we don't have to bump to gtkmm-2.14 immediately, as that would probably require pangomm, and that requires cairo-1.8, and that requires cairo to be unmasked to be able to unmask gtk+ set, which I want to unmask pretty much immediately now.