Maybe I'm totally overlooking something or misreading the docs, but I can't find a way to say in a requirements.txt file that a dependency is optional and its failure to install is okay. E.g., aiohttp supports using cchardet as an accelerator of chardet ( http://aiohttp.readthedocs.org/en/stable/#library-installation). I would like to be able to specify in my requirements.txt that I would like cchardet to be installed if possible, but it not being available -- which it might be as it doesn't have any Python 3.5 wheels ATM -- is fine and not the end of the world.
I'm also happy to push a patch upstream if there is something aiohttp should be setting in their setup.py instead (I thought maybe extras, but those seem to be hard requirements as well).
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