diff --git a/lib/Makefile.am b/lib/Makefile.am
index 7b235d0..aa8b159 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -91,3 +91,7 @@
 	ocaml \
 	st \
 	ts
+
+precross-%:
+	$(MAKE) -C $* precross
+precross: precross-nodejs precross-csharp precross-java