tce-load -i compiletc meson libdrm-dev libva-dev wayland-dev wayland-protocols python3.6-mako libXvmc-dev libXdamage-dev libxshmfence-dev libXxf86vm-dev libXrandr-dev gettext libelf-dev

https://mesa.freedesktop.org/archive/mesa-20.1.4.tar.xz
http://www.linuxfromscratch.org/patches/blfs/svn/mesa-20.1.4-add_xdemos-1.patch

cd mesa-20.1.4

patch -Np1 -i ../mesa-20.1.4-add_xdemos-1.patch

mkdir build
cd build

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

[-fno-rtti fails]

ninja [8m 56.35s]
sudo ninja install

Message: Configuration summary:
        
        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 drm surfaceless
        
        Vulkan drivers:  no
        
        llvm:            no
        
        Gallium drivers: vc4 v3d kmsro virgl swrast
        Gallium st:      mesa
        HUD lmsensors:   no
        
        Shared-glapi:    yes