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Projects with Special Dependencies
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In case your project has special (external) dependencies it is likely that
the build will fail, as the RTD server does not know of this dependencies.
You can however add a `requirements.txt` file to make RTD aware of these
dependencies and run the documentation build in a virtual environment with
these dependencies. In your documentation root (where the `conf.py` file is
located) place a `readthedocs.requirements.txt` file. It should have the
same format as any `pip` requirements file:

 .. code-block:: python

    slumber>=1.0
    matplotlib


This would for instance assure that `slumber` with a version higher 1.0 and
a version of `matplotlib` is installed.