Also, at this point in time, we'd often like to require gcc 4.8 instead of the catch-all c++11 of gcc 4.9, because e.g. netbsd-7 has it, and pkgsrc gcc is underwhelming. takes long to build, doesn't build on most architectures, etc. maybe once gcc 6 becomes common place we would want a catch-all c++11 and it wouldn't have a huge penalty as it currently does.