Luis Felipe <sirgazil@zoho.com> writes:

> I have a custom channel 
> (https://codeberg.org/luis-felipe/guix-channel-x) that had been working 
> fine for a very long time, but now running "guix pull" fails with the 
> following error:
>
> #+begin_quote
> building /gnu/store/3aghnb3nbxmgl5f2fsjchz27iwsdz0rl-luflac-x.drv...
> -builder for `/gnu/store/3aghnb3nbxmgl5f2fsjchz27iwsdz0rl-luflac-x.drv' 
> failed to produce output path
> `/gnu/store/zpmgrl9sz83ininzainjs9kjk25wymsw-luflac-x'
> build of /gnu/store/3aghnb3nbxmgl5f2fsjchz27iwsdz0rl-luflac-x.drv failed
> View build log at 
> '/var/log/guix/drvs/3a/ghnb3nbxmgl5f2fsjchz27iwsdz0rl-luflac-x.drv.gz'.
> cannot build derivation 
> `/gnu/store/99w71gp2rxzb7g1ij62qag769bryxwzi-profile.drv': 1 dependencies
> couldn't be built
> guix pull: error: build of 
> `/gnu/store/99w71gp2rxzb7g1ij62qag769bryxwzi-profile.drv' failed
> #+end_quote
>
>
> And the referenced build log reads as follows:
>
> #+begin_quote
> (repl-version 0 1 1)
> guix repl: warning: '%gnu-build-system-modules' is deprecated,
> use '%default-gnu-imported-modules' instead
> WARNING: (guix build guile-easy-build-system):
> imported module (guix build utils) overrides core binding `delete'
> (exception match-error (value "match") (value "no matching pattern") 
> (value ()))
> #+end_quote

Before anything else, did you change anything in your private channel
before the breakage occurred?

Alternatively, you could see how =guix pull= reacts to the = --commit =
option.  It is possible that something got broken in master branch, yet
again.