emacs/make-depend.el will compute all other related dependencies
except this one:
notmuch-version is not top-level `require' expression in
notmuc-lib.el[c] but conditional based on the existence of
notmuch-version.el[c].
emacs/make-depend.el does not know now notmuch-version.el[c] becomes
into existence but emacs/Makefile.local does know.
$(dir)/.eldeps.x: $(dir)/.eldeps
@cmp -s $^ $@ || cp $^ $@
-include $(dir)/.eldeps.x
+
+# Add the one dependency make-deps.el does not have visibility to.
+$(dir)/notmuch-lib.elc: $(dir)/notmuch-version.elc
+
endif
CLEAN+=$(dir)/.eldeps $(dir)/.eldeps.tmp $(dir)/.eldeps.x