default.nix applies the patch through the package overlay.
A descriptive .patch file contains the standalone upstream source change.
README.md explains the problem, scope, reproduction, upstream status, Nix integration, and recorded validation limits.
Companion verify-* tools live beside the patch when needed; otherwise the README gives commands for the package's existing tests.

Keep package-specific evidence in its directory. Patch headers explain the change independently of Nix, and default.nix preserves existing patches.

Package	Repair
Abseil	Public BMI2 header in Electron, Deno, and Signal's vendored copies
GnuTLS	Wait for the UDP server socket before connecting
Prometheus	Complete parsing before inspecting the test editor state
pytest-xdist	Check worker replacements and allow startup on loaded builders
SciPy	Account for floating-point rounding in STFT tests

Local NixOS integration

The x86-64-v3 optional module imports this directory's default.nix directly, so the patch overlay applies only to hosts using that package set. Prometheus patches its separate assets derivation; Python packages use pythonPackagesExtensions.

The pytest-xdist directory also owns its outer-worker limit and remote-worker event timeout. These package overrides add no skipped tests. Existing nixpkgs exclusions remain separate from these repairs.

The review used Python 3.14.7 and the pinned x86-64-v3 package set. Host-flake evaluation verified patch wiring, Python install checks, and Prometheus's reference to the patched assets. No complete NixOS rebuild was performed. Individual READMEs distinguish package builds, focused tests, and checks that have not been run.