Re: sqlite library

[Stefan Monnier]

> Can you someone advise me what should I use, what should I put in
> `Package-Requires:`; maybe the best would be to point to a simple
> package with a similar problem?

See https://elpa.gnu.org/packages/triples.html

It does not announce any dependency in its `Package-Requires:` (other
than Emacs≥25 and `seq`).  Instead it checks at runtime whether/which
kind of sqlite support is available:

  (unless (pcase-exhaustive triples-sqlite-interface
              ('builtin
               (and (fboundp 'sqlite-available-p) (sqlite-available-p)))
              ('emacsql (require 'emacsql nil t)))
    (error "The triples package requires either Emacs 29 or the emacsql package 
to be installed."))

`Package-Requires:` is just a tool to help users install the package;
it doesn't have to be "exact".


        Stefan