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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
* @}
*/