anchor.diff:  in
   builder rec {
     pname = "guile";
  -  version = "3.0.7";
  +  version = "3.0.8";
   
     src = fetchurl {
       url = "mirror://gnu/${pname}/${pname}-${version}.tar.xz";
  -    sha256 = "sha256-9X2GxwYgJxv863qb4MgXRKAz8IrcfOuoMsmRerPmkbc=";
  +    sha256 = "sha256-2qcGClbygE6bdMjX5/6L7tErQ6qyeJo4WFGD/MF7ihM=";
     };
   
     outputs = [ "out" "dev" "info" ];
  
positive.code: , pkg-config
  , pkgsBuildBuild
  , readline
  }:
  
  let
  
negative.code:   ]
    # Disable JIT on Apple Silicon, as it is not yet supported
    # https://debbugs.gnu.org/cgi/bugreport.cgi?bug=44505";
    ++ lib.optional (stdenv.isDarwin && stdenv.isAarch64) "--enable-jit=no"
    # At least on x86_64-darwin '-flto' autodetection is not correct:
    #  https://github.com/NixOS/nixpkgs/pull/160051#issuecomment-1046193028
    ++ lib.optional (stdenv.isDarwin) "--disable-lto";
  
    postInstall = ''
      wrapProgram $out/bin/guile-snarf --prefix PATH : "${gawk}/bin"
  