anchor.diff:      preConfigure = ''
         mkdir externals_cache
       '' + lib.concatStringsSep "\n"
  -        (lib.mapAttrsToList (dst: src: "cp ${src} ${dst}") externals) + ''
  +        (lib.mapAttrsToList (dst: src: "cp -r --no-preserve=mode ${src} ${dst}") externals) + ''
   
         chmod -w externals_cache
       '';
  
positive.code:     preBuild = ''
        make menuselect.makeopts
        substituteInPlace menuselect.makeopts --replace 'format_mp3 ' ""
        ./contrib/scripts/get_mp3_source.sh
      '';
  
      postInstall = ''
  
negative.code: { stdenv, pkgs, lib, fetchurl, fetchgit, fetchsvn,
    jansson, libxml2, libxslt, ncurses, openssl, sqlite,
    utillinux, dmidecode, libuuid, binutils, newt,
    lua, speex,
    srtp, wget, curl
  }:
  
  let
  