fatal error: 'limits.h' / 'math.h' file not found

[Kek5chen]

Pretty sure this is related to #21 in a way.

The difference being that I am on NixOS.

The error message I am getting is:

  assimp/include/assimp/vector3.h:55:13: fatal error: 'math.h' file not found
  thread 'main' panicked at /home/kx/.cargo/registry/src/index.crates.io-6f17d22bba15001f/russimp-sys-2.0.2/build.rs:209:10:
  called `Result::unwrap()` on an `Err` value: ClangDiagnostic("assimp/include/assimp/vector3.h:55:13: fatal error: 'math.h' file not found\n")
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

When I provide the environment variable C_INCLUDE_LIBRARY as $glibc/include it spits out this instead:

/nix/store/0ywz89gl18p0y5m7m8kz8vh1bkry0syf-glibc-2.39-52-dev/include/limits.h:124:16: fatal error: 'limits.h' file not found
  thread 'main' panicked at /home/kx/.cargo/registry/src/index.crates.io-6f17d22bba15001f/russimp-sys-2.0.2/build.rs:209:10:
  called `Result::unwrap()` on an `Err` value: ClangDiagnostic("/nix/store/0ywz89gl18p0y5m7m8kz8vh1bkry0syf-glibc-2.39-52-dev/include/limits.h:124:16: fatal error: 'limits.h' file not found\n")
  note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

I really do feel like this is not a user issue at this point because it does seem to correlate to the other issue. Also, openssl-sys manages to do it correctly as long as pkg-config and openssl are installed.

I hope you manage to figure this one out, I might have a look at it too if it keeps bothering me too much, though this is a pretty big blocker that having everything installed is just not enough to get this running.