> The Flylisp package in GNU ELPA [1] uses lexical binding and cl-lib,
> but lacks a Package-Requires header with corresponding dependencies
> on `(emacs "24.1")' and `(cl-lib "0.4")'.
>
> Without these dependencies, the package might accidentally be
> installed on Emacs 23, which does not support lexical binding, and
> it might fail to properly install on Emacs 24.1 and 24.2, which lack
> cl-lib.
>
> Please add a Package-Requires header with appropriate dependencies.

I have done so, thanks.