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# QLibraryInfo Class Reference
[com.trolltech.qt.core module]

The QLibraryInfo class provides information about the Qt library. More...

## Detailed Description

The QLibraryInfo class provides information about the Qt library.

Many pieces of information are established when Qt is configured. Installation paths, license information, and even a unique build key. This class provides an abstraction for accessing this information.

Function | Return value
--- | ---
`buildKey` | A string that identifies the Qt version and the configuration. This key is used to ensure that plugins link against the same version of Qt as the application.
`location` | The path to a certain Qt component (e.g., documentation, header files).
`licensee`, `licensedProducts` | Licensing information.

You can also use a `qt.conf` file to override the hard-coded paths that are compiled into the Qt library. For more information, see the Using qt.conf documentation.

See also `QSysInfo` and Using qt.conf.