Originally, I was getting the following error because responder was just recently added to nixos-unstable.
$ nixos-rebuild build-vm --flake github:exploitoverload/PwNixOS#pwnix --no-write-lock-file
building the system configuration...
warning: input 'nur' has an override for a non-existent input 'nixpkgs'
warning: not writing modified lock file of flake 'github:exploitoverload/PwNixOS':
• Added input 'nur':
'github:nix-community/NUR/a5ec361c610f7ec0235af6cc5090ae99a7cb84ee' (2023-07-14)
error: undefined variable 'responder'
at /nix/store/11iz5niv81khn86lsz6vwx15j85p3v1l-source/modules/packages/default.nix:109:11:
108| proxychains-ng
109| responder
| ^
110| ];
(use '--show-trace' to show detailed location information)
After updating the flake inputs, the error disappears!
Originally, I was getting the following error because
responder
was just recently added tonixos-unstable
.After updating the flake inputs, the error disappears!