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A user on the Sun C++ Forum asks "how do I set the source dir path for GDB"? There is no good answer in the current implementation. We should add an "Arguments" property to the Debugging node in project properties which lets the user add command line args. We might also consider a UI to handle this based on libraries the project uses. See http://forum.java.sun.com/thread.jspa?threadID=5132203 for the forum request.