N64 emulation works really well on the Librem 5!
#N64 setup
sudo apt install zlib1g-dev libpng-dev libsdl2-dev libfreetype6-dev libmupen64plus-dev make gcc git g++

for each URL:
https://github.com/mupen64plus/mupen64plus-core.git
https://github.com/mupen64plus/mupen64plus-ui-console.git
https://github.com/mupen64plus/mupen64plus-video-rice.git
https://github.com/mupen64plus/mupen64plus-audio-sdl.git
https://github.com/mupen64plus/mupen64plus-rsp-hle.git
https://github.com/mupen64plus/mupen64plus-input-sdl.git

Do:
git clone <URL>
cd <new repo>/projects/unix
make all
sudo make install
cd ~