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# The Feature Definition File

By modifying the configured `qconfig.h` file from `src/tools`, you can define a subset of the full Qt functionality that you wish to be available in your installation. The `-qconfig` option to configure is used to select the configuration.

Note that such modification is only supported on Qtopia Core platforms, where reducing the size of Qt is important and the application set is often fixed.

Note: Qtopia Core 4.0 does not support the `-qconfig` option.