Fix install target in Makefile to comply with Debian build procedures.
--- a/Makefile
+++ b/Makefile
@@ -26,7 +26,8 @@
 	# Oh, blatant plug: http://keetweej.vanheusden.com/wishlist.html
 
 install: setpwc
-	cp setpwc /usr/bin
+	install -p -D setpwc $(DESTDIR)/usr/bin/setpwc
+	install -p -D setpwc.1 $(DESTDIR)/usr/share/man/man1/setpwc.1
 
 clean:
 	rm -f $(OBJS) setpwc core
