Right now ffmpeg fails to build (a PR already got pulled but anyway), I commented ffmpeg packages in my nix condiguration and it still failed to build showing ffmpeg.
Report the build issue, if it hasn’t been reported through issues or pull requests yet.
And until the fix lands, disable all the things depending on the faulty package or roll back the system inputs and wait with the update until the fix lands.
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Generally waiting is the right and simplest call, especially when you can see the PR for a fix has already landed in master and now it’s just waiting for the build machinery to advance the channel.
If you feel you need to upgrade for some reason, there are various workarounds, depending on why you think you need to. These range from overlays, overrides, ephemeral shells, using a local dev copy of nixpkgs, virtual machines, flatpaks, docker, etc
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