anchor.diff:  with stdenv.lib;
   
   stdenv.mkDerivation rec {
  -  version = "0.25.3";
  +  version = "0.26";
     name = "notmuch-${version}";
   
     passthru = {
  
positive.code: 
    src = fetchurl {
      url = "http://notmuchmail.org/releases/${name}.tar.gz";
      sha256 = "1fyx20rjpwbf2j1v5fpa5s0rjnwhcgvijzh2qyinp8rlbh1qxmab";
    };
  
    nativeBuildInputs = [ pkgconfig ];
  
negative.code:         "{}" ";"
  
      for src in \
        util/crypto.c \
        notmuch-config.c \
        emacs/notmuch-crypto.el
      do
  