If you want to left the choice to user. You can just don't patch it. Or you can always patch it because user can still use package transformer to specify a custom ffmpeg.
jgart <jg...@dismail.de> writes:
> Does Guix have a declarative Guix API way of knowing if it is installing
> a package into foreign distro versus Guix System?
>
> I'm thinking of a function like `foreign-distro?`:
>
> ```
> (define-public peek
> (package
> (name "peek")
> ...
> (inputs
> `(,@(if (foreign-distro?) `(("ffmpeg" ,ffmpeg)) '())))
> ```
>
> The above includes ffmpeg in the inputs only if installing peek on a
> foreign distro. It could additionally patch the ffmpeg executable in
> a peek package phases if foreign-distro? returns #t.
>
> WDYT
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