tce-load -i compiletc cmake ninja brotli-dev highway-dev lcms2-dev libjpeg-turbo-dev giflib7-dev libpng-dev libwebp1-dev libavif-dev openexr-dev

wget https://github.com/libjxl/libjxl/archive/v0.11.2/libjxl-0.11.2.tar.gz

cd libjxl-0.11.2

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 -fno-exceptions -fno-rtti" -DCMAKE_INSTALL_PREFIX=/usr/local -DCMAKE_BUILD_TYPE=Release -DCMAKE_VERBOSE_MAKEFILE=TRUE -DBUILD_TESTING=OFF -DBUILD_SHARED_LIBS=ON -DJPEGXL_ENABLE_SKCMS=OFF -DJPEGXL_ENABLE_SJPEG=OFF -G Ninja ../

[-fno-rtti fails]

ninja [7m 26.53s]
sudo ninja install