tce-load -i compiletc python3.8-meson libdrm-dev libva-dev wayland-dev wayland-protocols python3.8-mako libXdamage-dev libxshmfence-dev libXxf86vm-dev libXrandr-dev gettext libelf-dev libvulkan-dev llvm-dev zstd-dev

wget https://mesa.freedesktop.org/archive/mesa-21.1.1.tar.xz
wget https://www.linuxfromscratch.org/patches/blfs/svn/mesa-21.1.1-add_xdemos-1.patch

cd mesa-21.1.1

patch -Np1 -i ../mesa-21.1.1-add_xdemos-1.patch

sudo cp /tmp/tcloop/llvm-dev/usr/local/bin/llvm-config /usr/local/bin

mkdir build
cd build

CC="gcc -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe" CXX="g++ -flto -march=armv8-a+crc -mtune=cortex-a72 -Os -pipe -DNDEBUG" meson --prefix=/usr/local --buildtype=plain -Dvalgrind=false -Dgallium-drivers="vc4,v3d,kmsro,virgl" -Dvulkan-drivers=broadcom ../

[-fno-rtti fails]

ninja [22m 49.35s]
sudo ninja install

        prefix:          /usr/local
        libdir:          lib
        includedir:      include
        
        OpenGL:          yes (ES1: yes ES2: yes)
        OSMesa:          no
        
        DRI platform:    drm
        DRI drivers:     no
        DRI driver dir:  /usr/local/lib/dri
        
        GLX:             DRI-based
        
        EGL:             yes
        EGL drivers:     builtin:egl_dri2 builtin:egl_dri3
        GBM:             yes
        EGL/Vulkan/VL platforms:   x11 wayland surfaceless drm
        
        Vulkan drivers:  broadcom
        Vulkan ICD dir:  share/vulkan/icd.d
        
        llvm:            yes
        llvm-version:    10.0.0
        
        Gallium drivers: vc4 v3d kmsro virgl
        Gallium st:      mesa
        HUD lmsensors:   no
        
        Shared-glapi:    yes