Jacob Hrbek <kreyren@rixotstudio.cz> writes:

> CC mentors -- please review and merge if appropriate

I think patches are best sent to guix-patches, even if they relate to a
bug filed against the guix package.

Also, for some reason, I'm missing the original mail for this bug.

Anyway, --with-commit doesn't work because of the reason displayed when
you try and use it. --with-source is what you should be using:

  guix build flatpak --with-source=https://github.com/flatpak/flatpak/releases/download/1.15.0/flatpak-1.15.0.tar.xz