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  /**
   * @defgroup pkg   Packages
   * @{
   * @brief          External libraries and applications
   *
   * Using packages
   * ==============
   * To add a package to the list of compiled modules you have to add it to the
   * `USEPKG` macro in your application's Makefile. If the package provides
   * header files you might need to update the `INCLUDE` macro, too:
   *
   * ~~~~~~~~ {.mk}
   * USEPKG += <pkg_name>
   * INCLUDE += $(RIOTPKG)/<pkg_name>/...
   * ~~~~~~~~
   *
   * Porting an external library
   * ===========================
   * Structure of a package
   * ----------------------
   * This module provides porting information for libraries and applications to use
   * with RIOT (to build an external module). If you'd like to add a package to RIOT
   * you need to add a directory with the name of your package to this directory.
   * This directory should contain at least two files:
   *
   *  * **Zero or more patch files**: Your patches of the upstream application of
   *    the package to make it build with RIOT.
   *  * **Makefile**: A Makefile describing how to get the upstream application,
   *    apply the patch and how to build the package as a RIOT module.
   *    A rough template for several methods of acquiring a package is provided in
   *    `pkg/Makefile.git`, `pkg/Makefile.http`, and `pkg/Makefile.svn`
   *
   * Creating a patch with git
   * -------------------------
   * Assuming your upstream library resides in a git repository, you can create the
   * patch files as follows:
   *  * checkout the targeted version of the upstream application
   *  * create a new branch (e.g. `riot-port`)
   *  * conduct necessary changes (e.g. edit, add, or remove some files)
   *  * commit your changes using `git commit`
   *  * create the patch files using `git format-patch -n riot-port`
   *  * move the resulting patch files to the corresponding subfolder of pkg
   * @}
   */