Without this
$ make -j test
intermittently fails and
$ make clean; make test/symbol-test
always fails (not that anybody would do the latter).
$(dir)/smtp-dummy: $(smtp_dummy_modules)
$(call quiet,CC) $^ -o $@
-$(dir)/symbol-test: $(dir)/symbol-test.o
+$(dir)/symbol-test: $(dir)/symbol-test.o lib/$(LINKER_NAME)
$(call quiet,CXX) $^ -o $@ -Llib -lnotmuch $(XAPIAN_LDFLAGS)
$(dir)/parse-time: $(dir)/parse-time.o parse-time-string/parse-time-string.o