pauldreik/arduino-due-makefile — pull request #2 by LieBtrau (2013-07-25 16:06:06+00:00)
Title: This makefile automatically compiles source code of added user libraries

You can see that I changed ADIR and PORT which are not related to this issue. These changes should not be merged to the master.
As for the other changes, it's up to you. ;-)