tce-load -i compiletc cmake ninja SDL2-dev

wget https://github.com/strukturag/libde265/releases/download/v1.0.18/libde265-1.0.18.tar.gz

cd libde265-1.0.18

mkdir build
cd build

cmake -LAH -DCMAKE_C_FLAGS_RELEASE="-flto -march=i486 -mtune=i686 -Os -pipe" -DCMAKE_CXX_FLAGS_RELEASE="-flto -march=i486 -mtune=i686 -Os -pipe" -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=TRUE -G Ninja ../

[-fno-exceptions fails]

ninja [0m 32.04s]
sudo ninja install