$NetBSD$

Fix installation - "-D" is not portable.

--- Makefile.orig	2021-09-06 03:51:46.000000000 +0000
+++ Makefile
@@ -300,10 +300,10 @@ install-man: $(INST_MAN1:%=$(man1dir)/%)
 
 $(bindir)/%: %
 	@echo "  INSTALL $@"
-	$(Q)install -D        $< $@ || exit 1;
+	$(Q)${BSD_INSTALL_PROGRAM} $< $@ || exit 1;
 $(man1dir)/%: %
 	@echo "  INSTALL $@"
-	$(Q)install -D -m 644 $< $@ || exit 1;
+	$(Q)${BSD_INSTALL_MAN} $< $@ || exit 1;
 
 .PHONY: FORCE
 
