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cmake doesn't take the nvcc specified by CUDA_HOME by default.
Consequently, the follow command failed for me because cmake still
used the nvcc from the default location (e.g. in my case
/usr/local/cuda/bin/nvcc):

```
$ PATH=/home/yangche/cuda-12.8/bin:$PATH CUDA_HOME=/home/yangche/cuda-12.8 pip install -e . -v
```

This minor fix enforces cmake to use the nvcc specified by the CUDA_HOME env.