The CVS automake, using --add-missing and not using AC_CONFIG_AUX_DIR,
is placing depcomp in whatever directory it first encounters C files in
then looking for it during configure in $(top_srcdir).
The problem appears to start on line 3054 of automake.in (in the
handle_dependencies function):
Unfortunately, not quite. This causes depcomp to be incorrectly pushed
onto DIST_COMMON in the sudir/Makefile.in when maybe_push_required_file
gets called by require_file_internal. Basically,
maybe_push_required_file expects $relative_dir to be set right and pushes
its file onto DIST_COMMON if
