would be great if TVheadend can be added to all great software available for RPI. I was able to installed in RPI2 and RPI3 following instructions in tvheadend forum.
I will add the link then to the GitHub issue as well. As always we have more requests then we are able to implement and bug fixing + maintaining existing install options generally has higher priority. So FeatHub is the best solution how we can decide which software request to add next, when time allows it .