anchor.diff:      #"--disable-atomic"
       "--disable-gcov"
       "--disable-valgrind"
  -    "--${boolEn (xorg != null)}-xlib"
  -    "--${boolEn (xorg != null)}-xlib-xrender"
  -    "--${boolEn (xorg != null)}-xcb"
  -    "--${boolEn (xorg != null)}-xlib-xcb"
  -    "--${boolEn (xorg != null)}-xcb-shm"
  +    "--${boolEn (libx11 != null && xorg.libXext != null)}-xlib"
  +    "--${boolEn (libx11 != null && xorg.libXrender != null)}-xlib-xrender"
  +    "--${boolEn (libx11 != null && libxcb != null)}-xcb"
  +    "--${boolEn (libx11 != null && libxcb != null)}-xlib-xcb"
  +    "--${boolEn (libx11 != null && libxcb != null)}-xcb-shm"
       "--disable-qt"
       "--disable-quartz"
       "--disable-quartz-font"
  
positive.code: 
    passthru = {
      srcVerification = fetchurl {
        failEarly = true;
        sha1Urls = map (n: "${n}.sha1.asc") src.urls;
        pgpKeyFingerprint = "C722 3EBE 4EF6 6513 B892  5989 11A3 0156 E0E6 7611";
        inherit (src) urls outputHash outputHashAlgo;
      };
    };
  
  
negative.code:     libspectre
      lzo
      mesa_noglu
      libx11
      libxcb
      xorg.libXext
      xorg.libXrender
      xorg.pixman
  