while there are many arguments in favor of something other than
/usr/local, I don't think the benefit exceeds the cost.

If we use something like the FreeBSD `ports' mechanism, it would seem
that those who have special requirements (e.g., building against
multiple versions of Tcl/Tk at the same time) can always find the
source and build against that; those who don't can just suck down the
binary packages and avoid wasting their time rebuilding the exact same
binaries they'd get in the binary package.

As an alternative, installing into /usr/local/PKG-VER with symlinks
from /usr/local might also work..

						- Bill