.. change::
    :tags: feature, platform
    :tickets: 7256

    The SQLAlchemy C extensions have been replaced with all new implementations
    written in Cython.  Like the C extensions before, pre-built wheel files
    for a wide range of platforms are available on pypi so that building
    is not an issue for common platforms.  For custom builds, ``python setup.py build_ext``
    works as before, needing only the additional Cython install.  ``pyproject.toml``
    is also part of the source now which will establish the proper build dependencies
    when using pip.


    .. seealso::

        :ref:`change_7256`

.. change::
    :tags: change, platform
    :tickets: 7311

    SQLAlchemy's source build and installation now includes a ``pyproject.toml`` file
    for full :pep:`517` support.

    .. seealso::

        :ref:`change_7311`
