How to Set Up For Mobian Development?

[a-wai]

Well, my desktop runs Mint, which is Debian (sort of...) but I can't compile on it for the Aarch64... So I guess I'll need to install an Aarch64 debian distro (Mobian even?) in Qemu?

I'd suggest you rather install and amd64 debian in qemu (it will be much faster, assuming your host machine is also amd64), and then:

Code:

sudo dpkg --add-architecture arm64
sudo apt update

This will enable the arm64 repos. You can then install arm64 dev packages using <package>:arm64, for instance to install gtk3 dev package, it would be something like:

Code:

sudo apt install libgtk-3-dev:arm64

And then cross-compile your software the "usual" way.