I finally munged lbforth.c (https://gist.github.com/lbruder/10007431) into compiling cleanly on mostly-stock v7 with the system compiler (lbforth itself does fine on 211BSD, but it needs a little help to build in a real K&R environment).

Which would be nice, except that when it gets to the linker....

$ cc -o 4th forth.c
ld:forth.o: Local symbol botch

WTF?

How do I begin to debug this?

Adam