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# PyQt4 and Qt v5

## Building Against Qt v5

PyQt4 can be built against Qt v5 in exactly the same way that it is built against Qt v4. However only a Qt v4 compatible subset of Qt v5 is supported, specifically:

- any classes added in Qt v5 are not supported
- any new features added in Qt v5 to classes that exist in Qt v4 are supported
- any features that are marked as deprecated in Qt v5 are supported.

The --no-deprecated option to PyQt4’s configure.py can be used to disable the support for the deprecated features. This can be useful in the porting of PyQt4 applications to PyQt5.

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