'make build' fails because lib/csu/common_elf/common.h uses '__weak_extern'
which isn't defined.  It's defined in something like cdefs_elf.h, but if I
try to #include that in common.h, I get clashes with symbols in cdefs_aout.h.

I've tried a couple days' sups since then, with no change.  Any ideas?

-s