Let's make Jellyfish the best release so far!

We have: the main jobset starting at 425 failures, x86_64-darwin at 829, and aarch64-linux at ~1120. The numbers may seem large, but one weird trick appropriate fix may fix many at once.

How can I help???

• Choose some package from those that fail on Hydra. Hurry before the good ones have been taken!
• Find a fix. That may mean simply restricting meta.platforms, in case the package inherently doesn't support what it has in there ATM.
• Typically the package was broken on master already. You can verify that on Hydra - example URL: https://hydra.nixos.org/job/nixpkgs/trunk/bash.x86_64-linux In that case base the fix on master and request backporting in the description of the pull request.
• Ping this issue from the PR, e.g. /cc ZHF 18.09 Zero Hydra Failures #45960. Do this also if you have some WIP. Alternatively you may just post a note in this issue. If the breakage is specific to darwin 18.09 Zero Hydra Failures (Darwin) #45961 or aarch64 18.09 Zero Hydra Failures (aarch64) #45962 mention the respective issue instead.

The remaining packages will be marked as broken before the release (on the failing platforms), i.e. at the end of September. /cc @NixOS/nixpkgs-committers, but everyone can help out!