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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 Qt/Embedded platforms, where reducing the size of Qt is important and the application set is often fixed.

Note: Qt/Embedded 4.0 does not support the `-qconfig` option.