Re: Symbol's function definition is void: locating the code

["Óscar Fuentes" <ofv@wanadoo.es>]

Óscar Fuentes <ofv@wanadoo.es> writes:

>> I sometimes face errors like this:
>>
>> "avy-menu: Symbol's function definition is void:
>> with-current-buffer-window"
>>
>> OK, so a package misses some function which is probably provided by
>> another package (missing dependency).
>
> Which version is your Emacs? avy-menu requires the latest release of
> Emacs (24.5)

Correction: as implicitly stated below, avy-menu requires Emacs 24.4 (at
least).

>> How do I locate the package which is able to provide me the
>> function?
>>
>> Most of the time I get lucky by searching the web with the error
>> message. However, this time (and some other times), I am not able to
>> find the missing code.
>
> What I do is searching the missing symbol, probably with "emacs".
>
> For your specific case above I searched the Emacs sources and found that
> with-current-buffer-window was introduced on 2014-03-16, which means
> that *probably* it was released on Emacs 24.4. That was an Emacs
> feature, if the missing piece is in a package, googling is the way to
> go, as mentioned above. However, any package worth its salt must mention
> its dependencies, versions included. The current avy-menu.el mentions
>
> ;; Package-Requires: ((emacs "24.3") (avy "0.3.0"))
>
> I think that (emacs "24.3") is wrong, because that version was released
> before with-current-buffer-window was coded into Emacs.