diff --git a/Makefile b/Makefile
index 091cf0645..0844831f1 100644
--- a/Makefile
+++ b/Makefile
@@ -113,6 +113,11 @@ $(eval $(call rule_for, \
   with_local_version \
 ))
 
+$(eval $(call rule_for, \
+  OCC, %.o, %.m, \
+  $$(CC) $$(SFLAGS) $$(CFLAGS) -c $$< -o $$@ \
+))
+
 $(eval $(call rule_for, \
   LD, %.$$(EXE), , \
   $$(LD) $$^ $$(LDFLAGS) -o $$@ \