[plt-dev] Segfault running setup-plt

My incremental build today died during setup-plt without an error
message (multiple times, actually, when I retried it in various
degrees of "clean-ness"), so I blew away Library/PLT Scheme/ and
trunk/, checked out the trunk again, and ran configure, make, and make
install.  The make install died as soon as setup-plt started:

mzscheme/mzscheme3m -X "/Users/cce/plt/trunk/collects" -l setup
setup-plt: bootstrapping from source...
make[1]: *** [install-3m] Segmentation fault
make: *** [install] Error 2

Anyone know what might be causing this?

-- 
Carl Eastlund