I'm not really sure where to put everything. Just everything in /usr/share/avr? This will cause when building avr-gcc to find everything

This Patch Submission will be closed as part of the migration to the Phabricator Differential application. It will need to be resubmitted using arcanist as described in Submitting The Package.

For existing repositories:

You will need to re-clone the common repository from its new location:
https://dev.solus-project.com/source/common.git

After that, you can automatically migrate to using the new Diffusion
repositories on Phabricator by running:

make -jNN pull

where NN is a number of parallel tasks typically between 1-15.