tce-load -i compiletc meson llvm-dev libdrm-dev libva2-dev libvdpau-dev python3.6-mako libXvmc-dev libXdamage-dev libxshmfence-dev libXxf86vm-dev libXrandr-dev gettext elfutils-dev zstd-dev libvulkan-dev

wget https://mesa.freedesktop.org/archive/mesa-20.3.1.tar.xz

cd mesa-20.3.1

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

mkdir build
cd build

CC="gcc -flto -march=pentium-m -mtune=i686 -Os -pipe -DNDEBUG" CXX="g++ -flto -march=pentium-m -mtune=i686 -Os -pipe -DNDEBUG" meson --prefix=/usr/local --buildtype=plain -Dglx=dri -Dosmesa=gallium -Dgallium-nine=false -Dvalgrind=disabled -Dlibunwind=disabled -Dplatforms=x11 ../

[-fno-rtti fails]

ninja [22m 16.72s]
sudo ninja install

Message: Configuration summary:
        
        prefix:          /usr/local
        libdir:          lib
        includedir:      include
        
        OpenGL:          yes (ES1: yes ES2: yes)
        
        OSMesa:          libOSMesa(Gallium)
        
        DRI platform:    drm
        DRI drivers:     i915 i965 r100 r200 nouveau
        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:  amd intel swrast
        Vulkan ICD dir:  share/vulkan/icd.d
        
        llvm:            yes
        llvm-version:    8.0.0
        
        Gallium drivers: r300 r600 radeonsi nouveau virgl svga swrast iris
        Gallium st:      mesa xa xvmc xvmc vdpau va
        HUD lmsensors:   no
        
        Shared-glapi:    yes