CMake errors on open example

[shlee853]

I'm trying to build april-tag-detect examples for opencv on VOXL.

Actually this examples is based on opencv 3.4, but, I updated version to 4.2.

https://gitlab.com/voxl-public/core-libs/voxl-opencv

It fails on build because of missing f package.

yocto:~/opencv/examples/april-tag-detect$ cmake CMakeLists.txt 
-- The C compiler identification is GNU 4.9.3
-- The CXX compiler identification is GNU 4.9.3
-- Check for working C compiler: /usr/bin/cc
-- Check for working C compiler: /usr/bin/cc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
CMake Error at CMakeLists.txt:4 (find_package):
  By not providing "FindOpenCV.cmake" in CMAKE_MODULE_PATH this project has
  asked CMake to find a package configuration file provided by "OpenCV", but
  CMake did not find one.

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

    OpenCVConfig.cmake
    opencv-config.cmake

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


-- Configuring incomplete, errors occurred!
See also "/home/root/opencv/examples/april-tag-detect/CMakeFiles/CMakeOutput.log".
yocto:~/opencv/examples/april-tag-detect$ 

Could you please let me know advice to find opencv package on VOXL?

thanks,

[Chad Sweet]

4.5 is hosted here
http://voxl-packages.modalai.com/stable/

[shlee853]

@Chad-Sweet I'm not compiling opencv libraries.

as you know above scripts, I has some errors on building examples for opencv.

I think it can't find FindOpenCV.cmake file during compiling.

Thanks,

[Chad Sweet]

This cmake file has a good example of finding OpenCV libs using cmake

https://gitlab.com/voxl-public/core-libs/libmodal_exposure/-/blob/master/library/CMakeLists.txt