Minimal support for multilib builds. For a little more information, see: <http://airs.com/ian/configure/configure_8.html> The master (and probably more up-to-date) copies of the 'config-ml.in' and 'symlink-tree' files are maintained in the GCC development tree at <https://gcc.gnu.org/svn.html>. The same is probably true also for the 'multi.m4' file.