diff --git a/makefile b/makefile
--- a/makefile
+++ b/makefile
@@ -50,7 +50,7 @@ gst_packages:
 	sudo aptitude install python-gi gir1.2-gst-plugins-base-1.0 libgirepository-1.0-1 gir1.2-gstreamer-1.0 gstreamer1.0-tools gstreamer1.0-plugins-good gstreamer1.0-pulseaudio 
 
 packages:
-	sudo aptitude install coffeescript freemind normalize-audio audacity python-pygoocanvas python-pygame gir1.2-goocanvas-2.0-9
+	sudo aptitude install coffeescript freemind normalize-audio audacity python-pygoocanvas python-pygame gir1.2-goocanvas-2.0-9 libffi-dev
 
 raspberry_pi_virtualenv:
 	mkdir -p env_pi
diff --git a/pydeps b/pydeps
--- a/pydeps
+++ b/pydeps
@@ -22,5 +22,6 @@ faulthandler==2.3
 treq==0.2.1
 mock==1.0.1
 toposort==1.0
+pyserial==2.7
 
 scales==1.0.6