by Kabbone » Tue Jan 15, 2019 8:46 pm
You should get a bit familiar with AUR before blindly using it, because everybody can upload there without any security checks as far as I know and in the end it's just scripts how to compile the package and create a package for pacman for it, so probably you would blindly install anything with root.
Often they insert just x86 x86_64 in the architecture variable, often you can just add your architecture there and it will run. Some packages do also have special configure flags for some arm devices and probably you want to use them if they are available, so could also be worth taking a look at there.
EDIT: like I assumed there are some configure options for mythtv, you should check that out first before compiling and edit the PKGBUILD