Failed building and installing on RPI ZERO

[antoine-voiry]

Hello
I am trying to install the example gadget on a rpi zero, I keep getting
from google.protobuf import json_format ModuleNotFoundError: No module named 'google'

make --no-print-directory install-am
/bin/mkdir -p '/usr/local/bin'
/bin/bash ./libtool --mode=install /usr/bin/install -c client/bluetoothctl monitor/btmon tools/rctest tools/l2test tools/l2ping tools/bccmd tools/bluemoon tools/hex2hcd tools/mpris-proxy tools/btattach '/usr/local/bin'
libtool: install: /usr/bin/install -c client/bluetoothctl /usr/local/bin/bluetoothctl
libtool: install: /usr/bin/install -c monitor/btmon /usr/local/bin/btmon
libtool: install: /usr/bin/install -c tools/rctest /usr/local/bin/rctest
libtool: install: /usr/bin/install -c tools/l2test /usr/local/bin/l2test
libtool: install: /usr/bin/install -c tools/l2ping /usr/local/bin/l2ping
libtool: install: /usr/bin/install -c tools/bccmd /usr/local/bin/bccmd
libtool: install: /usr/bin/install -c tools/bluemoon /usr/local/bin/bluemoon
libtool: install: /usr/bin/install -c tools/hex2hcd /usr/local/bin/hex2hcd
libtool: install: /usr/bin/install -c tools/mpris-proxy /usr/local/bin/mpris-proxy
libtool: install: /usr/bin/install -c tools/btattach /usr/local/bin/btattach
/bin/mkdir -p '/usr/local/libexec/bluetooth'
/bin/bash ./libtool --mode=install /usr/bin/install -c src/bluetoothd obexd/src/obexd '/usr/local/libexec/bluetooth'
libtool: install: /usr/bin/install -c src/bluetoothd /usr/local/libexec/bluetooth/bluetoothd
libtool: install: /usr/bin/install -c obexd/src/obexd /usr/local/libexec/bluetooth/obexd
/bin/mkdir -p '/usr/local/lib/cups/backend'
/bin/bash ./libtool --mode=install /usr/bin/install -c profiles/cups/bluetooth '/usr/local/lib/cups/backend'
libtool: install: /usr/bin/install -c profiles/cups/bluetooth /usr/local/lib/cups/backend/bluetooth
/bin/mkdir -p '/etc/dbus-1/system.d'
/usr/bin/install -c -m 644 src/bluetooth.conf '/etc/dbus-1/system.d'
/bin/mkdir -p '/usr/share/dbus-1/services'
/usr/bin/install -c -m 644 obexd/src/org.bluez.obex.service '/usr/share/dbus-1/services'
/bin/mkdir -p '/usr/share/dbus-1/system-services'
/usr/bin/install -c -m 644 src/org.bluez.service '/usr/share/dbus-1/system-services'
/bin/mkdir -p '/usr/local/share/man/man1'
/usr/bin/install -c -m 644 tools/rctest.1 tools/l2ping.1 tools/bccmd.1 tools/btattach.1 tools/hid2hci.1 '/usr/local/share/man/man1'
/bin/mkdir -p '/usr/local/share/man/man8'
/usr/bin/install -c -m 644 src/bluetoothd.8 '/usr/local/share/man/man8'
/bin/mkdir -p '/lib/udev/rules.d'
/usr/bin/install -c -m 644 tools/97-hid2hci.rules '/lib/udev/rules.d'
/bin/mkdir -p '/lib/systemd/system'
/usr/bin/install -c -m 644 src/bluetooth.service '/lib/systemd/system'
/bin/mkdir -p '/usr/lib/systemd/user'
/usr/bin/install -c -m 644 obexd/src/obex.service '/usr/lib/systemd/user'
/bin/mkdir -p '/lib/udev'
/bin/bash ./libtool --mode=install /usr/bin/install -c tools/hid2hci '/lib/udev'
libtool: install: /usr/bin/install -c tools/hid2hci /lib/udev/hid2hci
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting pip
Downloading pip-20.3-py2.py3-none-any.whl (1.5 MB)
|████████████████████████████████| 1.5 MB 756 kB/s
Installing collected packages: pip
Attempting uninstall: pip
Found existing installation: pip 20.2.4
Uninstalling pip-20.2.4:
Successfully uninstalled pip-20.2.4
Successfully installed pip-20.3
Python3 package pybluez installing...
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Requirement already satisfied: pybluez in /usr/local/lib/python3.6/site-packages (0.23)
Python3 package protobuf installing...
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Requirement already satisfied: protobuf in /usr/local/lib/python3.6/site-packages (3.14.0)
Requirement already satisfied: six>=1.9 in /usr/local/lib/python3.6/site-packages (from protobuf) (1.15.0)
Python3 package python-dateutil installing...
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Requirement already satisfied: python-dateutil in /usr/local/lib/python3.6/site-packages (2.8.1)
Requirement already satisfied: six>=1.5 in /usr/local/lib/python3.6/site-packages (from python-dateutil) (1.15.0)
Python3 package gpiozero installing...
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Requirement already satisfied: gpiozero in /usr/local/lib/python3.6/site-packages (1.5.1)
Requirement already satisfied: colorzero in /usr/local/lib/python3.6/site-packages (from gpiozero) (1.1)
Python3 package colorzero installing...
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Requirement already satisfied: colorzero in /usr/local/lib/python3.6/site-packages (1.1)
'agt' pip module installing...
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Obtaining file:///home/pi/Alexa-Gadgets-Raspberry-Pi-Samples/src
Installing collected packages: agt
Attempting uninstall: agt
Found existing installation: agt 1.0
Uninstalling agt-1.0:
Successfully uninstalled agt-1.0
Running setup.py develop for agt
Successfully installed agt
Traceback (most recent call last):
File "launch.py", line 204, in
from agt.alexa_gadget import BLE, BT, _TRANSPORT_MODE, _ECHO_BLUETOOTH_ADDRESS
File "/home/pi/Alexa-Gadgets-Raspberry-Pi-Samples/src/agt/init.py", line 29, in
from agt.alexa_gadget import AlexaGadget
File "/home/pi/Alexa-Gadgets-Raspberry-Pi-Samples/src/agt/alexa_gadget.py", line 21, in
from google.protobuf import json_format
ModuleNotFoundError: No module named 'google'