$NetBSD$

Patches Makefile to not use -D argument to install.

--- Makefile.orig	2024-04-29 11:26:30.346342899 -0400
+++ Makefile	2024-04-29 11:26:49.024153733 -0400
@@ -34,8 +34,10 @@
 	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(OBJECTS)
 
 install:
-	install -D wadptr $(DESTDIR)$(PREFIX)/bin/wadptr
-	install -D wadptr.1 $(DESTDIR)$(PREFIX)/share/man/man1/wadptr.1
+	mkdir -p $(DESTDIR)$(PREFIX)/bin
+	mkdir -p $(DESTDIR)$(PREFIX)/share/man/man1
+	install wadptr $(DESTDIR)$(PREFIX)/bin/wadptr
+	install wadptr.1 $(DESTDIR)$(PREFIX)/share/man/man1/wadptr.1
 
 clean:
 	$(DELETE) $(EXECUTABLE)