无法使用python 3.8构建opencv-python

Question

OS:ubuntu我可以从命令行安装opencv-python。但是，当我尝试安装带有opencv-python依赖项的自建包时，biuld失败：

Building wheels for collected packages: opencv-python
  Building wheel for opencv-python (PEP 517): started
  Building wheel for opencv-python (PEP 517): finished with status 'error'
  ERROR: Complete output from command /usr/local/bin/python /usr/local/lib/python3.6/site-packages/pip/_vendor/pep517/_in_process.py build_wheel /tmp/tmp7jntqv2r:
  ERROR: 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-utbicth7/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
  Not searching for unused variables given on the command line.
  CMake Error: CMake was unable to find a build program corresponding to "Unix Makefiles".  CMAKE_MAKE_PROGRAM is not set.  You probably need to select a different build tool.
  -- Configuring incomplete, errors occurred!
  See also "/tmp/pip-install-utbicth7/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".


-- Trying "Unix Makefiles" generator - failure
  --------------------------------------------------------------------------------
  
  ********************************************************************************
  scikit-build could not get a working generator for your system. Aborting build.
  
  Building Linux wheels for Python 3.6 requires a compiler (e.g gcc).
  It can be installed using debian package manager:
  
    sudo apt-get install build-essential
  
  To build compliant wheels, consider using the manylinux system described in PEP-513.
  Get it with "dockcross/manylinux-x64" docker image:
  
    https://github.com/dockcross/dockcross#readme
  
  For more details, please refer to scikit-build documentation:
  
    http://scikit-build.readthedocs.io/en/latest/generators.html#linux
  
  ********************************************************************************
  ----------------------------------------
  ERROR: Failed building wheel for opencv-python

我怀疑问题出在scikit-build上。我确认我有忍者，让/gcc都有空。我手动设置了CMAKE_MAKE_PROGRAM=/usr/bin/make。

但仍然失败，并出现相同的错误。我

Answer 1

您缺少依赖项。请查看上面提供的错误消息的这一部分：

  Building Linux wheels for Python 3.6 requires a compiler (e.g gcc).
  It can be installed using debian package manager:
  
    sudo apt-get install build-essential

因此，请使用apt-get安装构建包所需的构建工具。

Answer 2

在安装opencv-python之前运行pip3 install -U pip。

Answer 3

最后弄清楚，当我在本地安装时，我对4.1.x版有一个要求，没有问题。当我安装依赖项时，它获取了最新的4.4版本，问题是1) pip版本是19.1 and2)从4.3 and2开始，轮子已经被更换了。