When I install python packages with "sudo pip install xxx" everything works fine. As soon as I use pip3 instead I get this :
error: invalid Python installation: unable to open /usr/include/python3.5m/pyconfig.h (No such file or directory)
This folder doesn't exists even though python3 is installed. I'm not sure what to do (I tried also to use a mkvirtualenv -p python3 but it fails for the same reason).