anchor.diff:      # https://github.com/neomutt/neomutt/pull/2367
       "--disable-include-path-in-cflags"
       "--zlib"
  -  ];
  +  ]
  +  ++ lib.optional enableZstd "--zstd"
  +  ++ lib.optional enableMixmaster "--mixmaster";
   
     # Fix missing libidn in mutt;
     # this fix is ugly since it links all binaries in mutt against libidn
  
positive.code:     description = "A small but very powerful text-based mail client";
      homepage    = "http://www.neomutt.org";
      license     = licenses.gpl2Plus;
      maintainers = with maintainers; [ cstrahan erikryb jfrankenau vrthra ma27 ];
      platforms   = platforms.unix;
    };
  }
  
negative.code: { lib, stdenv, fetchFromGitHub, gettext, makeWrapper, tcl, which
  , ncurses, perl , cyrus_sasl, gss, gpgme, libkrb5, libidn, libxml2, notmuch, openssl
  , lmdb, libxslt, docbook_xsl, docbook_xml_dtd_42, w3m, mailcap, sqlite, zlib
  , zstd, enableZstd ? true, enableMixmaster ? false
  }:
  
  stdenv.mkDerivation rec {
  