Add DESTDIR support to Makefile
--- RXTX.orig/Makefile.am
+++ RXTX/Makefile.am
@@ -81,13 +81,15 @@
 #  install librxtxSerial.so into the proper directory and copy $(JARTARGET) to its
 #  proper location
 install: all
+	$(mkinstalldirs) $(DESTDIR)$(RXTX_PATH)
+	$(mkinstalldirs) $(DESTDIR)$(JHOME)
 	@$(LIBTOOL_INST) \
 	`for i in $(TARGETLIB);do \
 		if [ -f $$i ];then \
 			echo $$i; \
 		fi; \
-	done` $(RXTX_PATH)
-	$(INSTALL_PROGRAM) $(JARTARGET) $(JHOME)/
+	done` $(DESTDIR)$(RXTX_PATH)
+	$(INSTALL_PROGRAM) $(JARTARGET) $(DESTDIR)$(JHOME)/
 
 clean-generic:
 	rm -rf $(DEST) $(TOP)/$(CLASSTOP)