> I think what you're looking for is more of: > > guix build --no-grafts mpv --with-input=youtube-dl=$(guix build > --no-grafts youtube-dl > --with-source=https://github.com/ytdl-org/youtube-dl/releases/download/2020.06.16/youtube-dl-2020.06.16.tar.gz) > > This didn't work for me though, I got: > guix build: error: > /gnu/store/9ncacjhzwlchpr1y5fd8ahdq59dsya20-youtube-dl-2020.06.16: > unknown package
Even if that worked, it doesn't fix the issue of the --with-source flag not working on the specified package's inputs. That command doesn't work because you're giving it a store path, not a package specification.
