Wrong path; nix fails to evaluate:

```
$ nix-env -f . -qa '*' --meta --xml --drv-path --show-trace
error: while evaluating `recurseIntoAttrs' at /home/bfo/nixpkgs/pkgs/top-level/all-packages.nix:193:22, called from /home/bfo/nixpkgs/pkgs/top-level/all-packages.nix:9035:17:
while evaluating `callPackageWith' at /home/bfo/nixpkgs/lib/customisation.nix:95:35, called from /home/bfo/nixpkgs/pkgs/top-level/all-packages.nix:9035:35:
while evaluating `makeOverridable' at /home/bfo/nixpkgs/lib/customisation.nix:56:24, called from /home/bfo/nixpkgs/lib/customisation.nix:97:5:
getting status of `/home/bfo/nixpkgs/pkgs/applications/sweethome3d.nix': No such file or directory
```