anchor.diff:  { stdenv
   , fetchurl
  +, lib
   
   , libdrm
   , mesa
  
positive.code:   ];
  
    configureFlags = [
      "--enable-drm"
      "--enable-x11"
      "--enable-glx"
  
negative.code: , xorg
  }:
  
  let
    version = "1.8.0";
  in
  stdenv.mkDerivation rec {
    name = "libva-${version}";
  
    src = fetchurl rec {
      urls = [
        ("https://github.com/01org/libva/releases/download/${version}/"
          + "${name}.tar.bz2")
        ("https://www.freedesktop.org/software/vaapi/releases/libva/"
          + "${name}.tar.bz2")
      ];
      hashOutput = false;
      sha256 = "eb92f3dcbe3981df3575348377263b31361113c77b2c3745f23174d1f562d658";
    };
  
  