Opencv support for c++ nnot found in l4t pytroch for jetpack 6.1(36.4.0)

[kabirkedia]

Hi @dusty-nv ,
I am building l4t-pytorch container using this link(https://hub.docker.com/r/dustynv/l4t-pytorch/tags specifically the r36.4.0 tag.
I tested with opencv, pytorcvh, torchvisiona dn torchaudio. They all work fine but the opencv support for c++ is absent.
I tried to look at your script that is there in

/tmp/opencv/build.sh

And I found out that there might be a couple of mistakes:

1. First there might an issue with the branch of opencv-python repository

#!/usr/bin/env bash
set -ex
echo "Building opencv-python ${OPENCV_VERSION}"

bash /tmp/opencv/install_deps.sh

git clone --branch {OPENCV_VERSION} --recursive https://github.com/opencv/opencv-python /opt/opencv-python

Here, the opencv_VERISON is wrong. the opencv-python repository does not have numbering according to versions. It just has 3.x,4.x etc. https://github.com/opencv/opencv-python/branches/all
2. the cmake and make command might have been omitted out by mistake

export ENABLE_CONTRIB=1
export CMAKE_BUILD_PARALLEL_LEVEL=$(nproc)
export CMAKE_ARGS="\
   -DCPACK_BINARY_DEB=ON \
   -DBUILD_EXAMPLES=OFF \
   -DBUILD_opencv_python2=OFF \
   -DBUILD_opencv_python3=ON \
   -DBUILD_opencv_java=OFF \
   -DCMAKE_BUILD_TYPE=RELEASE \
   -DCMAKE_INSTALL_PREFIX=/usr/local \
   -DCUDA_ARCH_BIN=${CUDA_ARCH_BIN} \
   -DCUDA_ARCH_PTX= \
   -DCUDA_FAST_MATH=ON \
   -DCUDNN_INCLUDE_DIR=/usr/include/$(uname -i)-linux-gnu \
   -DEIGEN_INCLUDE_PATH=/usr/include/eigen3 \
   -DWITH_EIGEN=ON \
   -DENABLE_NEON=ON \
   -DOPENCV_DNN_CUDA=ON \
   -DOPENCV_ENABLE_NONFREE=ON \
   -DOPENCV_EXTRA_MODULES_PATH=/opt/opencv-python/opencv_contrib/modules \
   -DOPENCV_GENERATE_PKGCONFIG=ON \
   -DOpenGL_GL_PREFERENCE=GLVND \
   -DWITH_CUBLAS=ON \
   -DWITH_CUDA=ON \
   -DWITH_CUDNN=ON \
   -DWITH_GSTREAMER=ON \
   -DWITH_LIBV4L=ON \
   -DWITH_GTK=ON \
   -DWITH_OPENGL=OFF \
   -DWITH_OPENCL=OFF \
   -DWITH_IPP=OFF \
   -DWITH_TBB=ON \
   -DBUILD_TIFF=ON \
   -DBUILD_PERF_TESTS=OFF \
   -DBUILD_TESTS=OFF"

# I added the following code to build it again:
mkdir -p build && cd build

# Run cmake with the specified arguments
cmake ../opencv ${CMAKE_ARGS}

# Compile and install
make -j$(nproc)
make install

# Return to the root directory and remove the build directory
cd ..
rm -rf build

Please look into it. Thanks!