--- Makefile.in.orig	2014-06-07 13:38:33.334423095 +0800
+++ Makefile.in	2014-06-07 13:39:03.004421673 +0800
@@ -1,9 +1,9 @@
 all:		./src/Makefile
-		cd ./src; make; cd ../
+		cd ./src; ${MAKE}
 
 install:	./src/Makefile ./doc/Makefile
-		cd ./src; make install; cd ../
-		cd ./doc; make install; cd ../
+		cd ./src; ${MAKE} install
+		cd ./doc; ${MAKE} install
 
 uninstall:	./src/Makefile ./doc/Makefile
 		cd ./src;make uninstall; cd ../