--- ./lib/Makefile.orig	2014-05-19 15:46:37.044025162 +0800
+++ ./lib/Makefile	2014-05-19 15:46:56.903021030 +0800
@@ -65,9 +65,9 @@
 all:	$(DBOWLIB)
 
 install: dbow.h $(DBOWLIB)
-	install -d $(DBOWDIR)
-	install -C -m 444 dbow.h $(PREFIX)/include
-	install -C -m 444 $(DBOWLIB) $(PREFIX)/lib
+	install -d $(DESTDIR)$(DBOWDIR)
+	install -C -m 444 dbow.h $(DESTDIR)$(PREFIX)/include
+	install -C -m 444 $(DBOWLIB) $(DESTDIR)$(PREFIX)/lib
 
 clean:
 	rm -f $(DBOWLIB) $(OBJS) a.out errs core