anchor.diff:  
   stdenv.mkDerivation rec {
     name = "mutt-${version}";
  -  version = "1.6.2";
  +  version = "1.7.0";
   
     src = fetchurl {
       url = "http://ftp.mutt.org/pub/mutt/${name}.tar.gz";
  -    sha256 = "13hxmji7v9m2agmvzrs7gzx8s3c9jiwrv7pbkr7z1kc6ckq2xl65";
  +    sha256 = "0idkamdiwj9fgqaz1vzkfg78cnmkzp74skv0ibw2xjfq6ds9hghx";
     };
   
     buildInputs =
  
positive.code:   ] ++ optional sslSupport  "--with-ssl"
      ++ optional saslSupport "--with-sasl";
  
    patches =
      optional withTrash (fetchpatch {
        name = "trash.patch";
        url = "https://aur.archlinux.org/cgit/aur.git/plain/trash.patch?h=mutt-sidebar";
        sha256 = "1hrib9jk28mqd02nzv0sx01jfdabzvnwcc5qjc3810zfglzc1nql";
      }) ++
      optional withSidebar (fetchpatch {
        name = "sidebar.patch";
        url = "https://aur.archlinux.org/cgit/aur.git/plain/sidebar.patch?h=mutt-sidebar";
        sha256 = "1l63wj7kw41jrh00mcxdw4p4vrbc9wld42s99liw8kz2aclymq5m";
      });
  
    meta = {
      description = "A small but very powerful text-based mail client";
      homepage = http://www.mutt.org;
  
negative.code:     ++ optional headerCache  gdbm
      ++ optional sslSupport   openssl
      ++ optional saslSupport  cyrus_sasl
      ++ optional gpgmeSupport gpgme;
  
    configureFlags = [
      (enableFeature headerCache  "hcache")
  