anchor.diff:  { stdenv
   , fetchurl
   , lib
  +#, meson
  +#, ninja
   
   , libdrm
   , libx11
  
positive.code:     inherit driverDir;
  
      srcVerification = fetchurl {
        failEarly = true;
        sha1Url = map (n: "${n}.sha1sum") src.urls;
        inherit (src) urls outputHash outputHashAlgo;
      };
    };
  
  
negative.code: 
    configureFlags = [
      "--enable-x11"
      "--enable-glx"
      "--enable-wayland"
      "--enable-va-messaging"
      "--with-drivers-path=${driverDir}"
    ];
  
    #mesonFlags = [
    #  "-Ddriverdir=${driverDir}"
    #  "-Dwith_x11=yes"
    #  "-Dwith_glx=yes"
    #  "-Dwith_wayland=yes"
    #];
  
    preInstall = ''
      installFlagsArray+=("LIBVA_DRIVERS_PATH=$out/lib/dri")
  