diff -uNr signify-31/Makefile signify-31.mod/Makefile
--- signify-31/Makefile	2022-03-13 21:29:52.000000000 +0000
+++ signify-31.mod/Makefile	2023-06-10 15:30:29.000000000 +0000
@@ -148,6 +148,8 @@
 signify: $O $(LIBBSD_DEPS)
 	$(CC) $(LDFLAGS) -o $@ $^ $(LIBBSD_LDFLAGS) $(LDLIBS)
 
+sha2.o: override CFLAGS += -DBYTE_ORDER=LITTLE_ENDIAN
+signify.o: override CFLAGS += -Wno-implicit-function-declaration
 zsig.o signify.o bcrypt_pbkdf.o: override CFLAGS += -Wno-pointer-sign
 
 clean-signify: