# Cannot install Open-CV

**URL:** <https://forum.opencv.org/t/cannot-install-open-cv/12516>\
**Category:** Python\
**Tags:** raspberrypi, programming\
**Created:** [March 24, 2023, 1:40pm UTC](https://forum.opencv.org/t/cannot-install-open-cv/12516 "2023-03-24T13:40:46Z")\
**Posts on this page:** 9\
**Page:** 1

<div class="post-metadata">

**Author:** ![vader7071](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/vader7071/32/7492_2.png) [@vader7071](https://forum.opencv.org/u/vader7071)\
**Post date:** [March 24, 2023, 1:40pm UTC](https://forum.opencv.org/t/cannot-install-open-cv/12516/1 "2023-03-24T13:40:46Z")

</div>

I am using Python on my Raspberry Pi 4B running Bullseye.

```auto
***** @raspberrypi:~ $ cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 11 (bullseye)"
NAME="Raspbian GNU/Linux"
VERSION_ID="11"
VERSION="11 (bullseye)"
VERSION_CODENAME=bullseye
ID=raspbian
ID_LIKE=debian
HOME_URL="http://www.raspbian.org/"
SUPPORT_URL="http://www.raspbian.org/RaspbianForums"
BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs"

Static hostname: raspberrypi
Icon name: computer
Machine ID: d6f00b01670b4dad8366c0004d859a63
Boot ID: 5ca54ba5fe234c6096b37f0a2e6b0af5
Operating System: Raspbian GNU/Linux 11 (bullseye)
Kernel: Linux 6.1.19-v8+
Architecture: arm64

```

I am trying to install Open-CV to use the library for a project I am working on. I have tried the following methods to install:

```auto
pip install opencv-python
pip3 install opencv-python
sudo apt install -y opencv-python
sudo apt install -y python3-opencv

```

and I am sure I am missing a few other methods I have tried.

The error, every time:

```auto
note: This error originates from a subprocess, and is likely not a problem with pip.
ERROR: Failed building wheel for opencv-python
Failed to build opencv-python
ERROR: Could not build wheels for opencv-python, which is required to install pyproject.toml-based projects

```

Yes, I have tried updating pip. I used

```auto
pip install --upgrade pip
pip3 install --upgrade pip
pip install --upgrade pip setuptools wheel
pip3 install --upgrade pip setuptools wheel

```

How do I get opencv installed? What am I missing? Thank you in advance for your help.

---

<div class="post-metadata">

**Author:** ![Dragon](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/dragon/32/7410_2.png) [@Dragon](https://forum.opencv.org/u/Dragon)\
**Post date:** [March 24, 2023, 8:40pm UTC](https://forum.opencv.org/t/cannot-install-open-cv/12516/2 "2023-03-24T20:40:06Z")

</div>

Your python is not correct intalled try purge and re-install

---

<div class="post-metadata">

**Author:** ![vader7071](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/vader7071/32/7492_2.png) [@vader7071](https://forum.opencv.org/u/vader7071)\
**Post date:** [March 31, 2023, 5:32pm UTC](https://forum.opencv.org/t/cannot-install-open-cv/12516/3 "2023-03-31T17:32:17Z")

</div>

I tried reinstalling Python, but then had another issue come up with the Pi, so I formatted the sd card and did a clean install of Pi OS 32-bit. Then went in, and only installed the libraries I needed for my project.

After a complete and total clean install, I still cannot install OpenCV-Python. This time, I tried installing via “Manage Packages” in Thonny on the Pi. It gets to the point of “Building wheel for opencv-python (PEP 517)” and this is where it fails.

I’ve copied the output/error message and posted below. In the full output, there is A LOT of “Installing: /tmp/pip-install-rg0384o8/opencv-python…”, so I just included the last 2 before the error.

```auto
  -- Installing: /tmp/pip-install-rg0384o8/opencv-python_43f9f441cce64b5aaf05bbe47f8689ce/_skbuild/linux-aarch64-3.9/cmake-install/share/opencv4/lbpcascades/lbpcascade_profileface.xml
  -- Installing: /tmp/pip-install-rg0384o8/opencv-python_43f9f441cce64b5aaf05bbe47f8689ce/_skbuild/linux-aarch64-3.9/cmake-install/share/opencv4/lbpcascades/lbpcascade_silverware.xml
  Copying files from CMake output
  Traceback (most recent call last):
    File "/tmp/tmpep4jioz9_in_process.py", line 280, in <module>
      main()
    File "/tmp/tmpep4jioz9_in_process.py", line 263, in main
      json_out['return_val'] = hook(**hook_input['kwargs'])
    File "/tmp/tmpep4jioz9_in_process.py", line 204, in build_wheel
      return _build_backend().build_wheel(wheel_directory, config_settings,
    File "/tmp/pip-build-env-ar1ozsrn/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 230, in build_wheel
      return self._build_with_temp_dir(['bdist_wheel'], '.whl',
    File "/tmp/pip-build-env-ar1ozsrn/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 215, in _build_with_temp_dir
      self.run_setup()
    File "/tmp/pip-build-env-ar1ozsrn/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 267, in run_setup
      super(_BuildMetaLegacyBackend,
    File "/tmp/pip-build-env-ar1ozsrn/overlay/lib/python3.9/site-packages/setuptools/build_meta.py", line 158, in run_setup
      exec(compile(code, __file__ , 'exec'), locals())
    File "setup.py", line 512, in <module>
      main()
    File "setup.py", line 262, in main
      skbuild.setup(
    File "/tmp/pip-build-env-ar1ozsrn/overlay/lib/python3.9/site-packages/skbuild/setuptools_wrap.py", line 673, in setup
      _classify_installed_files(
    File "setup.py", line 398, in _classify_installed_files_override
      with open('%spython/cv2/config-%s.py'
  FileNotFoundError: [Errno 2] No such file or directory: '_skbuild/linux-aarch64-3.9/cmake-install/python/cv2/config-3.py'
  ----------------------------------------
  ERROR: Failed building wheel for opencv-python
ERROR: Could not build wheels for opencv-python which use PEP 517 and cannot be installed directly
Process returned with code 1

```

---

<div class="post-metadata">

**Author:** ![vader7071](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/vader7071/32/7492_2.png) [@vader7071](https://forum.opencv.org/u/vader7071)\
**Post date:** [April 10, 2023, 8:09pm UTC](https://forum.opencv.org/t/cannot-install-open-cv/12516/4 "2023-04-10T20:09:48Z")

</div>

More information as I try to get OpenCV to install. It seems that it is a dependency that is causing the issue.

So the latest round shows:

```auto
Python: 3.9.2
Platform: Linux-6.1.21-v8+-aarch64-with-glibc2.31
glibc: glibc 2.31
machine: aarch64
bits: 32
pip: n/a
setuptools: 67.6.1
scikit-build: 0.16.7

```

And it is an error with CMake. I get the “building wheel for CMake” and then “Finished with error”.

I tried installing CMake by itself, and get the same error.

---

<div class="post-metadata">

**Author:** ![vader7071](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/vader7071/32/7492_2.png) [@vader7071](https://forum.opencv.org/u/vader7071)\
**Post date:** [April 11, 2023, 1:26pm UTC](https://forum.opencv.org/t/cannot-install-open-cv/12516/5 "2023-04-11T13:26:24Z")

</div>

Here is the output when trying to install OpenCV-Python from the command line using pip:

```auto
cwren@raspberrypi:~ $ pip install opencv-python
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting opencv-python
  Using cached opencv-python-4.7.0.72.tar.gz (91.1 MB)
  Installing build dependencies ... error
  error: subprocess-exited-with-error
  
  × pip subprocess to install build dependencies did not run successfully.
  │ exit code: 1
  ╰─> [346 lines of output]
      Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple, https://www.piwheels.org/simple
      Ignoring numpy: markers 'python_version == "3.6" and platform_machine != "aarch64" and platform_machine != "arm64"' don't match your environment
      Ignoring numpy: markers 'python_version == "3.7" and platform_machine != "aarch64" and platform_machine != "arm64"' don't match your environment
      Ignoring numpy: markers 'python_version == "3.8" and platform_machine != "aarch64" and platform_machine != "arm64"' don't match your environment
      Ignoring numpy: markers 'python_version <= "3.9" and sys_platform == "darwin" and platform_machine == "arm64"' don't match your environment
      Ignoring numpy: markers 'python_version == "3.9" and platform_machine != "aarch64" and platform_machine != "arm64"' don't match your environment
      Ignoring numpy: markers 'python_version == "3.10" and platform_system != "Darwin"' don't match your environment
      Ignoring numpy: markers 'python_version == "3.10" and platform_system == "Darwin"' don't match your environment
      Ignoring numpy: markers 'python_version >= "3.11"' don't match your environment
      Collecting setuptools==59.2.0
        Using cached https://www.piwheels.org/simple/setuptools/setuptools-59.2.0-py3-none-any.whl (952 kB)
      Collecting wheel==0.37.0
        Using cached https://www.piwheels.org/simple/wheel/wheel-0.37.0-py2.py3-none-any.whl (35 kB)
      Collecting cmake>=3.1
        Using cached cmake-3.26.3.tar.gz (35 kB)
        Installing build dependencies: started
        Installing build dependencies: finished with status 'done'
        Getting requirements to build wheel: started
        Getting requirements to build wheel: finished with status 'done'
        Preparing metadata (pyproject.toml): started
        Preparing metadata (pyproject.toml): finished with status 'done'
      Collecting pip
        Using cached https://www.piwheels.org/simple/pip/pip-23.0.1-py3-none-any.whl (2.1 MB)
      Collecting scikit-build>=0.13.2
        Using cached https://www.piwheels.org/simple/scikit-build/scikit_build-0.17.0-py3-none-any.whl (81 kB)
      Collecting numpy==1.19.3
        Using cached https://www.piwheels.org/simple/numpy/numpy-1.19.3-cp39-cp39-linux_armv7l.whl (10.5 MB)
      Collecting tomli
        Using cached https://www.piwheels.org/simple/tomli/tomli-2.0.1-py3-none-any.whl (12 kB)
      Collecting packaging
        Using cached https://www.piwheels.org/simple/packaging/packaging-23.0-py3-none-any.whl (42 kB)
      Collecting distro
        Using cached https://www.piwheels.org/simple/distro/distro-1.8.0-py3-none-any.whl (20 kB)
      Building wheels for collected packages: cmake
        Building wheel for cmake (pyproject.toml): started
        Building wheel for cmake (pyproject.toml): finished with status 'error'
        error: subprocess-exited-with-error
      
        × Building wheel for cmake (pyproject.toml) did not run successfully.
        │ exit code: 1
        ╰─> [299 lines of output]
      
      
            --------------------------------------------------------------------------------
            -- Trying 'Ninja' generator
            --------------------------------
            ---------------------------
            ----------------------
            -----------------
            ------------
            -------
            --
            Not searching for unused variables given on the command line.
            CMake Error: CMake was unable to find a build program corresponding to "Ninja". CMAKE_MAKE_PROGRAM is not set. You probably need to select a different build tool.
            -- Configuring incomplete, errors occurred!
            See also "/tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
            --
            -------
            ------------
            -----------------
            ----------------------
            ---------------------------
            --------------------------------
            -- Trying 'Ninja' generator - failure
            --------------------------------------------------------------------------------
      
      
      
            --------------------------------------------------------------------------------
            -- Trying 'Unix Makefiles' generator
            --------------------------------
            ---------------------------
            ----------------------
            -----------------
            ------------
            -------
            --
            Not searching for unused variables given on the command line.
            -- The C compiler identification is GNU 10.2.1
            -- Detecting C compiler ABI info
            -- Detecting C compiler ABI info - done
            -- Check for working C compiler: /usr/bin/cc - skipped
            -- Detecting C compile features
            -- Detecting C compile features - done
            -- The CXX compiler identification is GNU 10.2.1
            -- Detecting CXX compiler ABI info
            -- Detecting CXX compiler ABI info - done
            -- Check for working CXX compiler: /usr/bin/c++ - skipped
            -- Detecting CXX compile features
            -- Detecting CXX compile features - done
            -- Configuring done
            -- Generating done
            -- Build files have been written to: /tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_cmake_test_compile/build
            --
            -------
            ------------
            -----------------
            ----------------------
            ---------------------------
            --------------------------------
            -- Trying 'Unix Makefiles' generator - success
            --------------------------------------------------------------------------------
      
            Configuring Project
              Working directory:
                /tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-build
              Command:
                /usr/bin/cmake /tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159 -G 'Unix Makefiles' -DCMAKE_INSTALL_PREFIX:PATH=/tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-install/src/cmake/data -DPYTHON_VERSION_STRING:STRING=3.9.2 -DSKBUILD:INTERNAL=TRUE -DCMAKE_MODULE_PATH:PATH=/tmp/pip-build-env-mu42xera/overlay/lib/python3.9/site-packages/skbuild/resources/cmake -DPYTHON_EXECUTABLE:PATH=/usr/bin/python3 -DPYTHON_INCLUDE_DIR:PATH=/usr/include/python3.9 -DPYTHON_LIBRARY:PATH=/usr/lib/arm-linux-gnueabihf/libpython3.9.so -DPython_EXECUTABLE:PATH=/usr/bin/python3 -DPython_ROOT_DIR:PATH=/usr -DPython_FIND_REGISTRY:STRING=NEVER -DPython_INCLUDE_DIR:PATH=/usr/include/python3.9 -DPython_LIBRARY:PATH=/usr/lib/arm-linux-gnueabihf/libpython3.9.so -DPython3_EXECUTABLE:PATH=/usr/bin/python3 -DPython3_ROOT_DIR:PATH=/usr -DPython3_FIND_REGISTRY:STRING=NEVER -DPython3_INCLUDE_DIR:PATH=/usr/include/python3.9 -DPython3_LIBRARY:PATH=/usr/lib/arm-linux-gnueabihf/libpython3.9.so -DCMAKE_BUILD_TYPE:STRING=Release
      
            -- The CXX compiler identification is GNU 10.2.1
            -- Detecting CXX compiler ABI info
            -- Detecting CXX compiler ABI info - done
            -- Check for working CXX compiler: /usr/bin/c++ - skipped
            -- Detecting CXX compile features
            -- Detecting CXX compile features - done
            -- ***************************************************
            -- Build CMake from source: ON
            -- ***************************************************
            -- SuperBuild - CMakeProject-src-download
            -- SuperBuild - CMakeProject-src-download - URL: https://github.com/Kitware/CMake/releases/download/v3.26.3/cmake-3.26.3.tar.gz
            -- SuperBuild - CMakeProject-src-download - CMakeProject_SOURCE_DIR: /tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/CMake-src
            -- Looking for __GLIBC__
            -- Looking for __GLIBC__ - found
            -- Looking for __GLIBC_MINOR__
            -- Looking for __GLIBC_MINOR__ - found
            -- SuperBuild - CMakeProject-build
            -- SuperBuild - CMakeProject-build - CMakeProject_BINARY_DIR: /tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-build/CMakeProject-build
            -- SuperBuild - CMakePythonDistributions
            -- Configuring done
            -- Generating done
            CMake Warning:
              Manually-specified variables were not used by the project:
      
                PYTHON_EXECUTABLE
                PYTHON_INCLUDE_DIR
                PYTHON_LIBRARY
                PYTHON_VERSION_STRING
                Python3_EXECUTABLE
                Python3_FIND_REGISTRY
                Python3_INCLUDE_DIR
                Python3_LIBRARY
                Python3_ROOT_DIR
                Python_EXECUTABLE
                Python_FIND_REGISTRY
                Python_INCLUDE_DIR
                Python_LIBRARY
                Python_ROOT_DIR
                SKBUILD
      
      
            -- Build files have been written to: /tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-build
            Scanning dependencies of target CMakeProject-src-download
            [3%] Creating directories for 'CMakeProject-src-download'
            [7%] Performing download step (download, verify and extract) for 'CMakeProject-src-download'
            -- Downloading...
               dst='/tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-build/cmake-3.26.3.tar.gz'
               timeout='none'
            -- Using src='https://github.com/Kitware/CMake/releases/download/v3.26.3/cmake-3.26.3.tar.gz'
            -- [download 0% complete]
            -- [download 1% complete]
            -- [download 2% complete]
            -- [download 3% complete]
            -- [download 4% complete]
            -- [download 5% complete]
            -- [download 6% complete]
            -- [download 8% complete]
            -- [download 11% complete]
            -- [download 12% complete]
            -- [download 18% complete]
            -- [download 31% complete]
            -- [download 42% complete]
            -- [download 53% complete]
            -- [download 66% complete]
            -- [download 78% complete]
            -- [download 89% complete]
            -- [download 100% complete]
            -- verifying file...
                   file='/tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-build/cmake-3.26.3.tar.gz'
            -- Downloading... done
            -- extracting...
                 src='/tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-build/cmake-3.26.3.tar.gz'
                 dst='/tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/CMake-src'
            -- extracting... [tar xfz]
            -- extracting... [analysis]
            -- extracting... [rename]
            -- extracting... [clean up]
            -- extracting... done
            [11%] No update step for 'CMakeProject-src-download'
            [15%] No patch step for 'CMakeProject-src-download'
            [19%] No configure step for 'CMakeProject-src-download'
            [23%] No build step for 'CMakeProject-src-download'
            [26%] No install step for 'CMakeProject-src-download'
            [30%] Completed 'CMakeProject-src-download'
            [30%] Built target CMakeProject-src-download
            Scanning dependencies of target CMakeProject-build
            [34%] Creating directories for 'CMakeProject-build'
            [38%] No download step for 'CMakeProject-build'
            [42%] No update step for 'CMakeProject-build'
            [46%] No patch step for 'CMakeProject-build'
            [50%] Performing configure step for 'CMakeProject-build'
            loading initial cache file /tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-build/initial-cache.txt
            loading initial cache file /tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-build/CMakeProject-build-prefix/tmp/CMakeProject-build-cache-Release.cmake
            -- The C compiler identification is GNU 10.2.1
            -- The CXX compiler identification is GNU 10.2.1
            -- Detecting C compiler ABI info
            -- Detecting C compiler ABI info - done
            -- Check for working C compiler: /usr/bin/cc - skipped
            -- Detecting C compile features
            -- Detecting C compile features - done
            -- Detecting CXX compiler ABI info
            -- Detecting CXX compiler ABI info - done
            -- Check for working CXX compiler: /usr/bin/c++ - skipped
            -- Detecting CXX compile features
            -- Detecting CXX compile features - done
            -- Checking if compiler supports C11 _Thread_local
            -- Checking if compiler supports C11 _Thread_local - yes
            -- Checking if compiler supports needed C++17 constructs
            -- Checking if compiler supports needed C++17 constructs - yes
            -- Checking if compiler supports C++ make_unique
            -- Checking if compiler supports C++ make_unique - yes
            -- Checking if compiler supports C++ filesystem
            -- Checking if compiler supports C++ filesystem - yes
            -- Looking for unsetenv
            -- Looking for unsetenv - found
            -- Looking for environ
            -- Looking for environ - not found
            -- Looking for pthread.h
            -- Looking for pthread.h - found
            -- Performing Test CMAKE_HAVE_LIBC_PTHREAD
            -- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
            -- Looking for pthread_create in pthreads
            -- Looking for pthread_create in pthreads - not found
            -- Looking for pthread_create in pthread
            -- Looking for pthread_create in pthread - found
            -- Found Threads: TRUE
            -- Checking whether wstring is available
            -- Checking whether wstring is available - yes
            -- Checking whether C compiler has ptrdiff_t in stddef.h
            -- Checking whether C compiler has ptrdiff_t in stddef.h - yes
            -- Checking whether C compiler has ssize_t in unistd.h
            -- Checking whether C compiler has ssize_t in unistd.h - yes
            -- Checking whether C compiler has clock_gettime
            -- Checking whether C compiler has clock_gettime - yes
            -- Checking whether CXX compiler has setenv
            -- Checking whether CXX compiler has setenv - yes
            -- Checking whether CXX compiler has unsetenv
            -- Checking whether CXX compiler has unsetenv - yes
            -- Checking whether CXX compiler has environ in stdlib.h
            -- Checking whether CXX compiler has environ in stdlib.h - no
            -- Checking whether CXX compiler has utimes
            -- Checking whether CXX compiler has utimes - yes
            -- Checking whether CXX compiler has utimensat
            -- Checking whether CXX compiler has utimensat - yes
            -- Checking whether CXX compiler struct stat has st_mtim member
            -- Checking whether CXX compiler struct stat has st_mtim member - yes
            -- Checking whether CXX compiler struct stat has st_mtimespec member
            -- Checking whether CXX compiler struct stat has st_mtimespec member - no
            -- Looking for include files sys/types.h, ifaddrs.h
            -- Looking for include files sys/types.h, ifaddrs.h - found
            -- Checking whether CXX compiler has rlimit64
            -- Checking whether CXX compiler has rlimit64 - yes
            -- Looking for C++ include execinfo.h
            -- Looking for C++ include execinfo.h - found
            -- Checking whether backtrace works with this C++ compiler
            -- Checking whether backtrace works with this C++ compiler - yes
            -- Looking for C++ include dlfcn.h
            -- Looking for C++ include dlfcn.h - found
            -- Checking whether dladdr works with this C++ compiler
            -- Checking whether dladdr works with this C++ compiler - yes
            -- Looking for C++ include cxxabi.h
            -- Looking for C++ include cxxabi.h - found
            -- Checking whether cxxabi works with this C++ compiler
            -- Checking whether cxxabi works with this C++ compiler - yes
            -- Checking whether CXX compiler has getloadavg
            -- Checking whether CXX compiler has getloadavg - yes
            -- Checking whether <ext/stdio_filebuf.h> is available
            -- Checking whether <ext/stdio_filebuf.h> is available - yes
            -- Performing Test HAVE_SOCKADDR_IN6_SIN6_ADDR
            -- Performing Test HAVE_SOCKADDR_IN6_SIN6_ADDR - Success
            -- Performing Test HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
            -- Performing Test HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID - Success
            -- Looking for connect in socket;
            -- Looking for connect in socket; - not found
            -- Looking for gethostname
            -- Looking for gethostname - found
            -- Could NOT find OpenSSL, try to set the path to OpenSSL root folder in the system variable OPENSSL_ROOT_DIR (missing: OPENSSL_CRYPTO_LIBRARY OPENSSL_INCLUDE_DIR)
            CMake Error at Utilities/cmcurl/CMakeLists.txt:608 (message):
              Could not find OpenSSL. Install an OpenSSL development package or
              configure CMake with -DCMAKE_USE_OPENSSL=OFF to build without OpenSSL.
      
      
            -- Configuring incomplete, errors occurred!
            See also "/tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-build/CMakeProject-build/CMakeFiles/CMakeOutput.log".
            See also "/tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-build/CMakeProject-build/CMakeFiles/CMakeError.log".
            gmake[2]: *** [CMakeFiles/CMakeProject-build.dir/build.make:129: CMakeProject-build-prefix/src/CMakeProject-build-stamp/CMakeProject-build-configure] Error 1
            gmake[1]: *** [CMakeFiles/Makefile2:127: CMakeFiles/CMakeProject-build.dir/all] Error 2
            gmake: *** [Makefile:149: all] Error 2
            Traceback (most recent call last):
              File "/tmp/pip-build-env-mu42xera/overlay/lib/python3.9/site-packages/skbuild/setuptools_wrap.py", line 670, in setup
                cmkr.make(make_args, install_target=cmake_install_target, env=env)
              File "/tmp/pip-build-env-mu42xera/overlay/lib/python3.9/site-packages/skbuild/cmaker.py", line 693, in make
                self.make_impl(clargs=clargs, config=config, source_dir=source_dir, install_target=install_target, env=env)
              File "/tmp/pip-build-env-mu42xera/overlay/lib/python3.9/site-packages/skbuild/cmaker.py", line 738, in make_impl
                raise SKBuildError(msg)
      
      
                =============================DEBUG ASSISTANCE=============================
                If you are seeing a compilation error please try the following steps to
                successfully install cmake:
                1) Upgrade to the latest pip and try again. This will fix errors for most
                   users. See: https://pip.pypa.io/en/stable/installing/#upgrading-pip
                2) If on Linux, with glibc < 2.12, you can set PIP_ONLY_BINARY=cmake in
                   order to retrieve the last manylinux1 compatible wheel.
                3) If on Linux, with glibc < 2.12, you can cap "cmake<3.23" in your
                   requirements in order to retrieve the last manylinux1 compatible wheel.
                4) Open an issue with the debug information that follows at
                   https://github.com/scikit-build/cmake-python-distributions/issues
      
                Python: 3.9.2
                platform: Linux-6.1.21-v8+-aarch64-with-glibc2.31
                glibc: glibc 2.31
                machine: aarch64
                bits: 32
                pip: n/a
                setuptools: 67.6.1
                scikit-build: 0.17.0
                PEP517_BUILD_BACKEND=setuptools.build_meta
                =============================DEBUG ASSISTANCE=============================
      
            An error occurred while building with CMake.
              Command:
                /usr/bin/cmake --build . --target install --config Release --
              Install target:
                install
              Source directory:
                /tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159
              Working directory:
                /tmp/pip-install-f07bn_9r/cmake_5cec1d022fae45cdbe8510890bbbc159/_skbuild/linux-aarch64-3.9/cmake-build
            Please check the install target is valid and see CMake's output for more information.
      
            [end of output]
      
        note: This error originates from a subprocess, and is likely not a problem with pip.
        ERROR: Failed building wheel for cmake
      Failed to build cmake
      ERROR: Could not build wheels for cmake, which is required to install pyproject.toml-based projects
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error

× pip subprocess to install build dependencies did not run successfully.
│ exit code: 1
╰─> See above for output.

note: This error originates from a subprocess, and is likely not a problem with pip.
cwren@raspberrypi:~ $ 

```

When I run “cmake version”, it returns 3.22.6

---

<div class="post-metadata">

**Author:** ![berak](https://avatars.discourse-cdn.com/v4/letter/b/85f322/32.png) [@berak](https://forum.opencv.org/u/berak)\
**Post date:** [April 12, 2023, 7:45am UTC](https://forum.opencv.org/t/cannot-install-open-cv/12516/6 "2023-04-12T07:45:09Z")

</div>

> [@vader7071](#):
>
> and did a clean install of Pi OS 32-bit.

please reconsider this.  
now pip cant find anything prebuilt for 32bit (they might have given up long time ago about this). and it tries to get cmake to build _numpy_ from scratch …

rule of thumb: if pip starts building wheels, you’re WAY OFF the trodden path …

again, make your life easy, &try to find a proper 64bit os for your pi, that has better support from pip

> [@vader7071](#):
>
> in Thonny on the Pi.

oh noes ! no, no, no !  
please avoid thonny (or any other silly noob ide), which install it’s own python. now you got 2 !

---

<div class="post-metadata">

**Author:** ![vader7071](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/vader7071/32/7492_2.png) [@vader7071](https://forum.opencv.org/u/vader7071)\
**Post date:** [April 12, 2023, 12:54pm UTC](https://forum.opencv.org/t/cannot-install-open-cv/12516/7 "2023-04-12T12:54:23Z")

</div>

So a lot in this post, the TLDR; version:

1. I am going to try a 64bit OS, thank you

2. Is there a better ide or way to run the \*.py file other than Thonny? I just used it because it came in the OS install bundle

Now for the more detailed version.

> [@berak](#):
>
> please reconsider this.  
> now pip cant find anything prebuilt for 32bit (they might have given up long time ago about this). and it tries to get cmake to build _numpy_ from scratch …
> 
> rule of thumb: if pip starts building wheels, you’re WAY OFF the trodden path …
> 
> again, make your life easy, &try to find a proper 64bit os for your pi, that has better support from pip

Ah. I forget why I started with 32bit. I think it had to do with PiCamera. But since I am running Bullseye OS and PiCamera used the old camera commands while PiCamera2 uses the new licbam setup. Luckily I have 2 units that are identical that I am prototyping with, so I will format and make one a 64bit and leave one as a 32bit and see the difference. That may be all of it. Thank you!

> [@berak](#):
>
> oh noes ! no, no, no !  
> please avoid thonny (or any other silly noob ide), which install it’s own python. now you got 2 !

Thonny was a default install on the OS image. Is there a better way? I use Sublime Text Editor 3 to write everything on my desktop and then just transfer the \*.py file to the Pi.

But having 2 installs kind of makes sense. When I do a clean OS install, I get Python 3.9.2. I tried to upgrade from 3.9.2 to 3.11.3 and PIP just seems to fight me the whole time after the upgrade. I followed the instructions here: [Update Python](https://linuxhint.com/update-python-raspberry-pi/) and I get the new install, and have the option to use 3.11.3 in Thonny, but when I use the terminal command line and run:

> pip install {module}

to install a new module, it always defaults to installing into the 3.9.2 installation and not the 3.11.3 instalaltion. So then I have to go and copy the “site-dist” folder from the 3.9.2 install to the 3.11.3 install folder. That “seeeeeeeems” to work, but I know it is not ideal.

---

<div class="post-metadata">

**Author:** ![vader7071](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/vader7071/32/7492_2.png) [@vader7071](https://forum.opencv.org/u/vader7071)\
**Post date:** [April 13, 2023, 2:35pm UTC](https://forum.opencv.org/t/cannot-install-open-cv/12516/8 "2023-04-13T14:35:09Z")

</div>

So, using a 64bit version of PiOS did the trick. I have now been able to install OpenCV. Thank you.

---

<div class="post-metadata">

**Author:** ![newtonty](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.opencv.org/newtonty/32/10946_2.png) [@newtonty](https://forum.opencv.org/u/newtonty)\
**Post date:** [August 11, 2024, 2:53pm UTC](https://forum.opencv.org/t/cannot-install-open-cv/12516/9 "2024-08-11T14:53:04Z")

</div>

hi. im sorry, im really new here. but can you explain what do you men to copy the “site-dist” folder from the 3.9.2 install to the 3.11.3 install folder. is it just copy all the library to the folder or something? thank you 🙂