Unable to find CUDAToolkit


We would like to use VPI with python 3.10. We are currently using Jetpack 5.1 since Jetpack 6 is in developer preview. Using the source provided for VPI in JetPack 6, I am trying to build python binding for version 3.10 in JetPack 5, VPI 2.X. While building I get the following error, which is that it is unable to find CUDAToolkit

CMake Error at CMakeLists.txt:115 (find_package):
  By not providing "FindCUDAToolkit.cmake" in CMAKE_MODULE_PATH this project
  has asked CMake to find a package configuration file provided by
  "CUDAToolkit", but CMake did not find one.

  Could not find a package configuration file provided by "CUDAToolkit" with
  any of the following names:


  Add the installation prefix of "CUDAToolkit" to CMAKE_PREFIX_PATH or set
  "CUDAToolkit_DIR" to a directory containing one of the above files.  If
  "CUDAToolkit" provides a separate development package or SDK, be sure it
  has been installed.

-- Configuring incomplete, errors occurred!

What I have done so far

  • Since I was able to build the bindings successfully on Jetpack 6, I was able to see what the CUDAToolkit_DIR was set to /usr/local/cuda/include. I set this in the CMakelist.txt but still got the same error.
  • I also verified that cuda-toolkit was installed
  • Current version of cuda is 11.4

Please let me know what additional information is required

Side Note:
There is an error in the CMakelists.txt provided in the /opt/nvidia/vpi3/src/python, line 47: find_package(vpi 2.0 REQUIRED) which should be find_package(vpi 3.0 REQUIRED) since Jetpack 6 is using vpi 3.0


VPI 2.x and 3.0 have lots of API changes.
This should not work and not be supported.

A better solution is to wait for the JetPack GA release.

I understand but since Jetpack 6 was delayed, I have no option. I will make the necessary changes, please help me understand why it isn’t able to find the CUDAToolkit Dir even if I am explicitly giving it a path


A possible cause is different cmake is used.
Could you try to use the same cmake version to see if it can work?


Hi @AastaLLL , thank you but since Jetpack 6 DP can’t be upgraded over OTA we won’t be proceeding with this method. We have found some other work around thank you for you help

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