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+Replaced the packaging is replaced from an old-fashioned :file:`setup.py` to an
+in-tree :pep:`517` build backend -- by :user:`webknjaz`.
+
+Whenever the end-users or downstream packagers need to build ``yarl`` from
+source (a Git checkout or an sdist), they have to pass a ``config_settings``
+flag ``--build-c-extensions``. If this flag is not set, a pure-python
+distribution will be built.
+
+Here is how this can be done with ``pip``:
+
+.. code-block:: console
+
+    $ python -m pip install . --config-settings=--build-c-extensions=
+
+This will also work with ``-e | --editable``.
+
+The same can be achieved via ``pypa/build``:
+
+.. code-block:: console
+
+    $ python -m pip build --config-settings=--build-c-extensions=
+
+Adding ``-w | --wheel`` can force ``pypa/build`` produce a wheel from source
+directly, as opposed to building an ``sdist`` and then building from it.