Managed to get PSP emulation working on the Librem 5!
git clone --recurse-submodules github.com/hrydgard/ppsspp.git
cd ppsspp
sudo apt install clang cmake libgl1-mesa-dev libsdl2-dev libvulkan-dev
./b.sh --rpi64
vi cmake/Toolchains/raspberry.armv8.cmake (add set(PPSSPP_PI_MODEL4 ON))
./b.sh -rpi64

wololo.net/downloads/index.php running on the L5:

Playing with X11 and Mate on the Librem 5 is a lot of fun.
setup
sudo apt install xinit xorg xterm x2x
X11
sudo systemctl stop phosh
sudo xinit -- -masterfd 9 9<>/dev/dri/card1
mouse and keyboard from a workstation
ssh -X librem 'x2x -east -to :0'

^^^ + mate:
sudo apt install mate compiz-mate compizconfig-settings-manager

Tremulous setup on Librem 5
wget github.com/GrangerHub/tremulou
sudo apt install -y cmake libgl1-mesa-dev libsdl2-dev libcurl4-openssl-dev libopenal-dev libfreetype6-dev git zip vim-nox curl rsync unzip
unzip ./v1.3.0-alpha.0.14.zip
cd tremulous-1.3.0-alpha.0.14/
make
cd ./build/release-linux-aarch64
mkdir ~/.tremulous/base
cd ~/.tremulous/base
wget github.com/GrangerHub/tremulou
unzip release-linux-x86_64.zip
mv gpp/* .
/home/purism/tremulous-1.3.0-alpha.0.14/build/release-linux-aarch64/tremulous

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