Can't install enviropHAT

I’ve got an enviropHAT that I wish to use with my RPi 3 and Hassio. I’ve enabled the component, been through an enabled I2C as per the instructions, but when Home Assistant starts, I see this in the logs:

2018-03-30 11:04:16 ERROR (SyncWorker_13) [homeassistant.util.package] Unable to install package envirophat==0.0.6: Command "/usr/bin/python3 -u -c "import setuptools, tokenize;__file__='/tmp/pip-build-vtrxldm8/RPi.GPIO/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /tmp/pip-s_e66sdc-record/install-record.txt --single-version-externally-managed --prefix  --compile --user --prefix=" failed with error code 1 in /tmp/pip-build-vtrxldm8/RPi.GPIO/
2018-03-30 11:04:16 ERROR (MainThread) [homeassistant.requirements] Not initializing sensor.envirophat because could not install requirement envirophat==0.0.6
2018-03-30 11:04:16 ERROR (MainThread) [homeassistant.setup] Unable to prepare setup for platform sensor.envirophat: Could not install all requirements.

Is there anything else I can try to get the sensor set up via Hassio?