de0612c46c
This rare sitation was caught when building zoom-us package: ``` automatically fixing dependencies for ELF files /nix/store/71d65fplq44y9yn2fvkpn2d3hrszracd-auto-patchelf-hook/nix-support/setup-hook: line 213: echo: write error: Broken pipe /nix/store/71d65fplq44y9yn2fvkpn2d3hrszracd-auto-patchelf-hook/nix-support/setup-hook: line 210: echo: write error: Broken pipe ``` The worst is that derivation continued and resulted into broken package: https://github.com/NixOS/nixpkgs/pull/55566#issuecomment-470065690 I hope, replacing `grep -q` with `grep` will remove this race condition.