* Use previous version of g++ to build the next (i.e., export PATH=/i686...).

* For some reason g++, cc1plus don't depend on dynamic libstdc++. If that
  changes, then we will need to switch to the Mac OS way.

* Cannot get 64-bit build of GCC to install into lib/. As a workaround,
  pre-creating lib and lib64 as a link to it (this way, if we need to
  rely on LD_LIBRARY_PATH setup in the driver, it will work).

* Need both binutils and GCC.