Motivation for this change

This package is a notification daemon that prints notifications to stdout - allowing the user process notifications as they wish, for example by integrating it in their existing statusbar.

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS linux)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions (Arch)
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Ensured that relevant documentation is up to date
• Fits CONTRIBUTING.md.

Note: I've added this:

postPatch = ''
  sed -i 's/printf(element_delimiter)/printf("%s", element_delimiter)/' src/output.c
'';

because gcc refuses to compile, erroring at line no. 88 in src/output.c:

              printf(element_delimiter);

(Furthermore, this happens on gcc 9.3.0 (NixOS), but not on gcc 10.2.0 (Arch), when compiling the normal way.). I'm not sure if this strategy is the best way to make it compile, so if anyone knows a better or more idiomatic way, then please tell!