error:
       … while evaluating the attribute 'optionalValue.value'
         at «https://releases.nixos.org/nixpkgs/nixpkgs-26.11pre1062790.c27cdad491a9/nixexprs.tar.xz?narHash=sha256-4Opnii0iGg8Dk8/rZ2IYh/HCHvg1B%2BUs5%2BQg%2BQy5c18%3D»/lib/modules.nix:1312:5:
         1311|
         1312|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |     ^
         1313|   };

       … while evaluating a branch condition
         at «https://releases.nixos.org/nixpkgs/nixpkgs-26.11pre1062790.c27cdad491a9/nixexprs.tar.xz?narHash=sha256-4Opnii0iGg8Dk8/rZ2IYh/HCHvg1B%2BUs5%2BQg%2BQy5c18%3D»/lib/modules.nix:1312:21:
         1311|
         1312|     optionalValue = if isDefined then { value = mergedValue; } else { };
             |                     ^
         1313|   };

       … while evaluating definitions from `/nix/store/dyxxi0sw8qh78awrfg0yds048vrjpac3-source/modules/clan/module.nix':

       (stack trace truncated; use '--show-trace' to show the full, detailed trace)

       error: Flake does not have 'input' named 'nixpkgs'