Index: Makefile
diff -u Makefile.orig Makefile
--- Makefile.orig	2005-12-28 16:29:24.000000000 +0900
+++ Makefile	2013-10-05 00:28:46.953959748 +0900
@@ -58,12 +58,14 @@
 
 realinstall:
 	$(INSTALL) -s $(COPY) -o $(BINOWN) -g $(BINGRP) -m 555 \
-		dtcpclient $(BINDIR)/dtcpclient
-	$(INSTALL) -d $(EXAMPLESDIR)
+		dtcpclient $(DESTDIR)$(BINDIR)/dtcpclient
+	$(INSTALL) -d $(DESTDIR)$(EXAMPLESDIR)
 	$(INSTALL) $(COPY) -o $(BINOWN) -g $(BINGRP) -m 555 \
-		dtcpclient.script $(EXAMPLESDIR)/dtcpclient.script
-	if [ ! -f $(SCRIPTSDIR)/dtcpclient.script ]; then \
-		cp -p $(EXAMPLESDIR)/dtcpclient.script $(SCRIPTSDIR)/; \
+		 dtcpclient.script \
+		$(DESTDIR)$(EXAMPLESDIR)/dtcpclient.script
+	if [ ! -f $(DESTDIR)$(SCRIPTSDIR)/dtcpclient.script ]; then \
+		cp -p $(DESTDIR)$(EXAMPLESDIR)/dtcpclient.script \
+			$(DESTDIR)$(SCRIPTSDIR)/; \
 	fi
 
 dist: