Edit /etc/apt/sources.list
and check that you have contrib
and non-free
and backports archives enabled:
deb http://httpredir.debian.org/debian jessie main contrib non-free
deb-src http://httpredir.debian.org/debian jessie main contrib non-free
deb http://httpredir.debian.org/debian jessie-backports main contrib non-free
deb-src http://httpredir.debian.org/debian jessie-backports main contrib non-free
Install some required system libraries and softwares:
sudo apt-get update
sudo apt-get install git python-pip python-dev libsmpeg0 libttspico-utils libsmpeg0 flac dialog libffi-dev libffi-dev libssl-dev portaudio19-dev build-essential libssl-dev libffi-dev sox libatlas3-base mplayer
You also need some packages from the backports:
sudo apt-get install -t jessie-backports python-setuptools
sudo apt-get install -t jessie-backports python-pyasn1