Python3 devel requirement

[jcubic]

The readme needs updating with this requirement if you don't install python devel it will fail to compile because of missing Python.h file.

[SeanHayes]

Is it Pillow that fails to compile? What platform are you on?

[jcubic]

I've lost my console output, because I've run the app in the same terminal. I'm on Fedora. invoking

sudo dnf isntall python3-devel

solved the problem.

[jcubic]

I can remove the package and see what's failing if you want.

[SeanHayes]

Does your Python env have wheel support? If so I think pip should install a precompiled version of Pillow, if not, then it'll try to compile from source.

[jcubic]

How can I test this? I've called pip3 install --user wheel and it was installed.

[SeanHayes]

It'll be hard to untangle the cause now that everything is installed. I'll add a note to the README that python-dev/python-devel may be required.