diff -ur supermin-5.1.19/supermin-4.1.4.old/src/Makefile.am supermin-5.1.19/supermin-4.1.4/src/Makefile.am
--- supermin-5.1.19/supermin-4.1.4.old/src/Makefile.am	2013-08-28 21:51:57.000000000 +0100
+++ supermin-5.1.19/supermin-4.1.4/src/Makefile.am	2017-09-23 11:09:32.911891180 +0100
@@ -79,7 +79,7 @@
 if HAVE_OCAML_INIFILES
 OCAMLPACKAGES += -package inifiles
 endif
-OCAMLFLAGS = -warn-error CDEFLMPSUVXYZ
+OCAMLFLAGS = -warn-error CDEFLMPSUVXYZ-3
 
 supermin: $(OBJECTS)
 	$(OCAMLFIND) $(BEST) $(OCAMLFLAGS) $(OCAMLPACKAGES) -linkpkg \
diff -ur supermin-5.1.19/supermin-4.1.4.old/src/Makefile.in supermin-5.1.19/supermin-4.1.4/src/Makefile.in
--- supermin-5.1.19/supermin-4.1.4.old/src/Makefile.in	2017-09-23 11:08:09.420324164 +0100
+++ supermin-5.1.19/supermin-4.1.4/src/Makefile.in	2017-09-23 11:09:39.321704394 +0100
@@ -1080,7 +1080,7 @@
 @HAVE_OCAMLOPT_FALSE@BEST = c
 @HAVE_OCAMLOPT_TRUE@BEST = opt
 OCAMLPACKAGES = -package unix,str $(am__append_2)
-OCAMLFLAGS = -warn-error CDEFLMPSUVXYZ
+OCAMLFLAGS = -warn-error CDEFLMPSUVXYZ-3
 SUFFIXES = .cmo .cmi .cmx .ml .mli .mll .mly
 @HAVE_PERLDOC_TRUE@noinst_DATA = \
 @HAVE_PERLDOC_TRUE@	../html/supermin.8.html