anchor.diff:  
     passthru = {
       srcVerification = fetchurl {
  +      inherit (src)
  +        outputHash
  +        outputHashAlgo
  +        urls;
         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;
       };
     };
   
  
positive.code:     libspectre
      lzo
      mesa_noglu
      xorg.libX11
      xorg.libxcb
      xorg.libXext
      xorg.libXrender
      xorg.pixman
  
negative.code:     #"--disable-atomic"
      "--disable-gcov"
      "--disable-valgrind"
      "--${boolEn (libx11 != null && xorg.libXext != null)}-xlib"
      "--${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"
  