diff --git a/ocaml/trexio/Makefile b/ocaml/trexio/Makefile
new file mode 100644
index 0000000..91d0b69
--- /dev/null
+++ b/ocaml/trexio/Makefile
@@ -0,0 +1,9 @@
+default: sources
+	dune build
+
+lib/trexio.ml: ../../trex.json read_json.py src/trexio.ml src/trexio.mli src/trexio_stubs.c
+	./read_json.py
+
+sources: lib/trexio.ml
+
+.PHONY: sources default