--- Makefile.in.orig	2014-06-08 23:17:52.261073676 +0800
+++ Makefile.in	2014-06-08 23:18:17.975100570 +0800
@@ -70,11 +70,11 @@ version_string.c: version
 	echo 'char *version_string = "'`cat version`'";' >version_string.c
 
 install: all
-	mkdir -p $(bindir)
-	$(INSTALL_PROGRAM) xplot $(bindir)/xplot
-	$(INSTALL) tcpdump2xplot.pl $(bindir)/tcpdump2xplot
-	mkdir -p $(mandir)
-	$(INSTALL_MAN) $(MANFILES) $(mandir)
+	mkdir -p $(DESTDIR)$(bindir)
+	$(INSTALL_PROGRAM) xplot $(DESTDIR)$(bindir)/xplot
+	$(INSTALL) tcpdump2xplot.pl $(DESTDIR)$(bindir)/tcpdump2xplot
+	mkdir -p $(DESTDIR)$(mandir)
+	$(INSTALL_MAN) $(MANFILES) $(DESTDIR)$(mandir)
 clean:
 	rm -f ${PROG} ${PROG}.old *.o version_string.c