Set CC, CXX explicitly in gnu makefiles.
Set CC, CXX explicitly in gnu makefiles.

GNU make defaults to cc for CC, but g++ (rather than c++) for CXX.  This
is usually OK, but not on current versions of OS X and its devtools,
where {cc,c++} is Clang and {gcc,g++} is GNU C. It could become a
problem elsewhere where GCC is not the default toolchain (as e.g.
FreeBSD plans to do).

Explicitly set CC and CXX to make sure the same compiler is used.

vslavik/bakefile,vslavik/bakefile,vslavik/bakefile