Would be of great value not only for new/fast boxes, but also for old/slow ones (as the cache can be located on a NFS drive too). See http://www.erikyyy.de/compilercache/
On a similar note. Is there enough in common between the various packages that use autoconf (like probing for glibc and gcc) that a global config.cache could be sourced to speed up the ./configure step in a build?
has to be checked
ccache is in portage.
