snappyatmega is a SNAPpy library that extends the functionality of Synapse SNAP modules that utilize the atmega128rfa1.
Download and extract the latest release zip file to Portal's snappyImages directory.
By default, this is located at ...\Documents\Portal\snappyImages on Windows.
The easiest way to install snappyatmega for use with SNAPbuild is using pip:
pip install git+https://github.com/synapse-wireless/snappy-atmega.git@master
Alternatively you can download the source, extract it, and install it:
python setup.py install