@santi
I used buildroot to make the FujiNet-PC binary https://github.com/mozzwald/Buildroot-YuzukiSBC/tree/miyoo
and then I used the OnionUI toolchain
https://github.com/mozzwald/Onion/tree/netsio
to build my fork of libretro-atari800 https://github.com/mozzwald/libretro-atari800/tree/netsio
Probably best to find out what toolchain folks use for the aftermarket OS/UI for your Anbernic and build FujiNet-PC / libretro-atari800 with netsio for your device