diff -u ms-sys-2.6.0/Makefile ms-sys-2.6.0-fixed/Makefile
--- ms-sys-2.6.0/Makefile	2015-09-27 20:39:45.000000000 +0200
+++ ms-sys-2.6.0-fixed/Makefile2020-01-06 16:43:55.181477511 +0100
@@ -121,7 +121,7 @@

 $(DESTDIR)$(MANDIR)/%: $(MAN)/$(dir $(*D))/$(*F)
 	install -D -m 644 $(MAN)/$(dir $(*D))$(*F) $@
-	gzip -f $@
+	gzip -n -f $@

 #$(DESTDIR)$(MANDIR)/%: $(MAN)/$(*F)
 #	echo t: $<