I've tried "make bootstrap" and "maintainer-clean", but no matter what I
do, Emacs hangs when it starts compiling auth-source.el:

make[2]: Entering directory `/home/larsi/src/emacs/trunk/lisp'
Compiling gnus/auth-source.el
^Cmake[2]: *** [gnus/auth-source.elc] Error 2
make[1]: *** [compile-main] Error 130
make: *** [lisp] Interrupt

Is there some other magical "make clean" incantation I don't know about
that's necessary?

--
(domestic pets only, the antidote for overdose, milk.)
  bloggy blog http://lars.ingebrigtsen.no/