Qt

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qmake issue on Debian

Make sure that the proper libqt3-dev-package is installed:

  • libqt3-dev (Qt development files) is for single threaded applications
  • libqt3-mt-dev (Qt development files (Threaded)) is for multi threaded applications

If qmake outputs the message 

QGDict::hashKeyString: Invalid null key

it could be that the wrong package is installed (non-threaded instead of threaded).

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