Build failure: Eigen/Dense not found in third_party/cubvh on WSL2

[sekiri]

Title:
Build failure: Eigen/Dense not found in third_party/cubvh on WSL2

Description:
I encountered a build error while installing CuMesh on a WSL2 environment. The compiler fails to locate the Eigen headers required for cubvh.

Environment:

• OS: Windows 11
• WSL version: 2.6.3.0
• CUDA: 12.8
• Python: 3.12 (venv)

Error Log:
The build process expects Eigen headers at .../CuMesh/third_party/cubvh/third_party/eigen, but it results in the following error:

/CuMesh/third_party/cubvh/include/gpu/api_gpu.h:3:10: fatal error: Eigen/Dense: No such file or directory
    3 | #include <Eigen/Dense>
      | ^~~~~~~~~~~~~

Cause:
The include path for cubvh is hardcoded to third_party/cubvh/third_party/eigen, but this directory or link is missing during a standard pip install ..

Workaround / Solution:
I manually created the missing directory and linked the top-level Eigen folder:

Navigate to CuMesh/third_party/cubvh

mkdir third_party

cd third_party

ln -s ../../../ eigen

After these steps, the build completed successfully.

[ChrisHughes]

Same issue here on a native linux compilation.

[mikaoioi]

Hi,
I can confirm the solution from @sekiri , you need to create the folders and copy (or link) Eigen in it (I'm on Linux).
In the CuMesh folder:

mkdir -p third_party/cubvh/third_party/eigen

then

cp -r Eigen third_party/cubvh/third_party/eigen/

And it compiles successfully.