all: $(VERSION_INDICES)
-$(VERSION_INDICES): %.idx: %.idx_stubs make_index_from_stubs.pl $(wildcard %.idx_stubs/*.stub)
+$(VERSION_INDICES): %.idx: %.idx_stubs
$(PERL) $(wordlist 2,2,$^) $@ $(wordlist 3,$(words $^),$^)
+.SECONDEXPANSION:
+$(VERSION_INDICES): %.idx: %.idx_stubs make_index_from_stubs.pl $$(wildcard $$*.idx_stubs/*.stub)
+