This problem is the Mac version of QTIFW-566.
Situation
1.Build a QtIFW in master branch
2.Create the installer using a folder of tutorial. 
ex <QtIFW DIR>/examples/tutorial 
http://goo.gl/nnfZrU
3.Run the installer
4.Dialog of the accompanying image is displayed, and installer.app can not be started.
Perhaps, is because the lock file can not be created in a double run prevention function. 
From OS X Mavericks, I can no longer save files in the hoge.app folder. 
Therefore, we can not create lock file.
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