$OpenBSD$
--- mlton/Makefile.orig	Thu May 26 13:14:05 2016
+++ mlton/Makefile	Thu May 26 13:14:43 2016
@@ -45,6 +45,7 @@ endif
 endif
 
 FLAGS += -target $(TARGET)
+FLAGS += -codegen c
 FLAGS += -verbose 2 -output "$(AOUT)"
 FLAGS += $(COMPILE_ARGS)
 
