anchor.diff:  
           ykinfo -v 1>/dev/null 2>&1
           if [ $? != 0 ]; then
  -            echo -n "Waiting $secs seconds for Yubikey to appear..."
  +            echo -n "Waiting $secs seconds for YubiKey to appear..."
               local success=false
               for try in $(seq $secs); do
                   echo -n .
  
positive.code:       default = false;
        type = types.bool;
        description = ''
              Enables support for authenticating with a Yubikey on LUKS devices.
              See the NixOS wiki for information on how to properly setup a LUKS device
              and a Yubikey to work with this feature.
            '';
      };
  
  
negative.code:     }
  
      ${optionalString (luks.yubikeySupport && (yubikey != null)) ''
      # YubiKey
      rbtohex() {
          ( od -An -vtx1 | tr -d ' \n' )
      }
  