so re-add COMPILER = base-clang ports-gcc.
However, do not yet set CXXFLAGS = -std=c++11 globally, because other
ports will currently break with it (speficically luatex). This will
be done after re-add the luatex patch dropped during the texlive
update and collect proper patches for pdftex (using our poppler
instead of the bundled one).
Successfully test-built on sparc64 and macppc by landry@.