Help with Fornjot on nix

[A-Walrus]

I tried to run cargo run --package export-validator from within nix develop with Fornjots nix flake. Aside from the fact that the flake was out-of-date (addressed by #1687) I get an error:
error while loading shared libraries: libstdc++.so.6: cannot open shared object file: No such file or directory
As far as I understand the export-validator is trying to open some shared library which doesn't really exist on NixOs...
Any ideas on how to fix this?

[A-Walrus]

Also getting this error when trying to nix run

error: couldn't read crates/fj-viewer/src/../assets/navigation_cube/cube.obj: No such file or directory (os error 2)
  --> crates/fj-viewer/src/assets.rs:15:13
   |
15 |             include_bytes!("../assets/navigation_cube/cube.obj");
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in the macro `include_bytes` (in Nightly builds, run with -Z macro-backtrace for more info)

error: couldn't read crates/fj-viewer/src/../assets/navigation_cube/cube.mtl: No such file or directory (os error 2)
  --> crates/fj-viewer/src/assets.rs:17:13
   |
17 |             include_bytes!("../assets/navigation_cube/cube.mtl");
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in the macro `include_bytes` (in Nightly builds, run with -Z macro-backtrace for more info)

error: couldn't read crates/fj-viewer/src/../assets/navigation_cube/front.png: No such file or directory (os error 2)
  --> crates/fj-viewer/src/assets.rs:19:13
   |
19 |             include_bytes!("../assets/navigation_cube/front.png");
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in the macro `include_bytes` (in Nightly builds, run with -Z macro-backtrace for more info)

error: couldn't read crates/fj-viewer/src/../assets/navigation_cube/right.png: No such file or directory (os error 2)
  --> crates/fj-viewer/src/assets.rs:21:13
   |
21 |             include_bytes!("../assets/navigation_cube/right.png");
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in the macro `include_bytes` (in Nightly builds, run with -Z macro-backtrace for more info)

error: couldn't read crates/fj-viewer/src/../assets/navigation_cube/rear.png: No such file or directory (os error 2)
  --> crates/fj-viewer/src/assets.rs:23:13
   |
23 |             include_bytes!("../assets/navigation_cube/rear.png");
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in the macro `include_bytes` (in Nightly builds, run with -Z macro-backtrace for more info)

error: couldn't read crates/fj-viewer/src/../assets/navigation_cube/left.png: No such file or directory (os error 2)
  --> crates/fj-viewer/src/assets.rs:25:13
   |
25 |             include_bytes!("../assets/navigation_cube/left.png");
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in the macro `include_bytes` (in Nightly builds, run with -Z macro-backtrace for more info)

error: couldn't read crates/fj-viewer/src/../assets/navigation_cube/top.png: No such file or directory (os error 2)
  --> crates/fj-viewer/src/assets.rs:27:13
   |
27 |             include_bytes!("../assets/navigation_cube/top.png");
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in the macro `include_bytes` (in Nightly builds, run with -Z macro-backtrace for more info)

error: couldn't read crates/fj-viewer/src/../assets/navigation_cube/bottom.png: No such file or directory (os error 2)
  --> crates/fj-viewer/src/assets.rs:29:13
   |
29 |             include_bytes!("../assets/navigation_cube/bottom.png");
   |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: this error originates in the macro `include_bytes` (in Nightly builds, run with -Z macro-backtrace for more info)

   Compiling fj-export v0.40.0 (/build/source/crates/fj-export)
error: could not compile `fj-viewer` due to 8 previous errors
warning: build failed, waiting for other jobs to finish...
                                                           

[Philipp-M]

Yeah I fixed that sometime ago locally already, but I guess I forgot to upstream that, I'll see if I can find time later or tomorrow (more likely) to fix this and the library issue.

I also have thought about adding a workflow that automatically updates flake inputs etc. when the rust-toolchain version is changed (as most likely the locked flake inputs are then out of date), but haven't found time for that yet.

[hannobraun]

Thank you for replying here, @Philipp-M!

Just to let you know, @A-Walrus has submitted a pull request in the meantime: #1690

[hannobraun]

Oh, and I've left some thoughts on automation here: #1687 (review)

[hannobraun]

Hey @A-Walrus, thank you for your pull requests! I'll take a look later.

Unfortunately I know very little about Nix. Maybe @Philipp-M (who contributed the Nix flake) can help?