Hello everyone ! Is there a guide out there (here or on the net), that provide step-by-step easy to understand explanantions on how to build a wallet on a Raspberry Pi 2 ?

Hello everyone ! I'd like to know, is there a complete guide on how to fork an altcoin (not to write one from scratch) ? Everything I found is for Scypt coins, something I am not interested in. Don't worry, I won't create a new ICO shitcoin, because I simply don't have time to elaborate a really brillant scam. I'd just want to know how things work since I like programming and I have a fair level in it  .