See the usage of OptionalExtension in src/module_list.py

On Saturday, September 12, 2015 at 9:48:34 PM UTC+2, Simon King wrote:
>
> Is it possible to have Cython files in src/sage/... that are only 
> compiled if a certain optional package is installed? That's not the same 
> as a dependency: A dependency would mean that the attempt to compile 
> the Cython file would trigger installation of the optional 
> package---Instead, I want that the Cython file is ignored by "sage -b" 
> unless the optional package was installed by the user. 
>

Yes 

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