anchor.diff:  
     src = fetchurl {
       url = "http://wiki.qemu.org/download/qemu-${version}.tar.bz2";
  -    sha256 = "1l88iqk0swqccrnjwczgl9arqsvy77bis862zxajy7z3dqdzshj9";
  +    sha256 = "0lqyz01z90nvxpc3nx4djbci7hx62cwvs5zwd6phssds0sap6vij";
     };
   
     buildInputs =
  
positive.code: 
  with stdenv.lib;
  let
    version = "2.6.1";
    audio = optionalString (hasSuffix "linux" stdenv.system) "alsa,"
      + optionalString pulseSupport "pa,"
      + optionalString sdlSupport "sdl,";
  
negative.code: 
    patches = [
      ./no-etc-install.patch
    ];
    hardeningDisable = [ "stackprotector" ];
  
    configureFlags =
      [ "--smbd=smbd" # use `smbd' from $PATH
  