--- Makefile.orig	2020-12-12 18:30:13 UTC
+++ Makefile
@@ -64,7 +64,7 @@ libcamlzip$(EXT_LIB): $(C_OBJS)
 .ml.cmx:
 	$(OCAMLOPT) -c $<
 .c.o:
-	$(OCAMLC) -c -ccopt -g $(ZLIB_I_OPT) $<
+	$(OCAMLC) -c -ccopt "$(CFLAGS)" $(ZLIB_I_OPT) $<
 
 clean:
 	rm -f *.cm*