CMake isn't finding right nvcc compiler.

[FieldingChase]

When I enter in "which nvcc", I get "usr/local/cuda-12.6/bin/nvcc", which is where my nvcc is located. When I run "CUDAToolkit_ROOT=/usr/local/cuda-12.6 ./build.sh", I get an error like this:

`CMake Error at cmake/hypre.cmake:43 (enable_language):
The CMAKE_CUDA_COMPILER:
/usr/bin/nvcc
is not a full path to an existing compiler tool.

Tell CMake where to find the compiler by setting either the environment
variable "CUDACXX" or the CMake cache entry CMAKE_CUDA_COMPILER to the full
path to the compiler, or to the compiler name if it is in the PATH.
Call Stack (most recent call first):
CMakeLists.txt:229 (add_hypre)`

I have tried "export CUDACXX=/usr/local/cuda-12.6/bin/nvcc" and then recompiling. I have tried "CUDAToolkit_ROOT=/usr/local/cuda-12.6/ CMAKE_CUDA_COMPILER=/usr/local/cuda-12.6/bin/nvcc ./build.sh".

The reason I need to the add the "CUDAToolkit_ROOT" flag is because CUDA won't compile without it. I am thinking I should use cuda toolkit v11.

Any help would be appreciated.