未能构建opencv-python

Question

我用的是吡喃。我创建了一个供使用的虚拟环境，当我试图安装opencv库时，收到了一条错误消息。

我使用pip命令安装openCV：

命令:pip安装opencv-python

这是当我使用以下命令时出现的错误消息：

错误：-

Collecting opencv-python
  Using cached https://files.pythonhosted.org/packages/e0/6f/237b730227927c15a68ec831a51bc83837bb65d54bf9651c08b474201b9a/opencv-python-4.4.0.40.tar.gz
  Installing build dependencies ... done
  Getting requirements to build wheel ... done
    Preparing wheel metadata ... done
Requirement already satisfied: numpy>=1.17.3 in f:\python\rio python\project rio\reco_env\lib\site-packages (from opencv-python) (1.19.1)
Building wheels for collected packages: opencv-python
  Building wheel for opencv-python (PEP 517) ... error
  Complete output from command "F:\Python\Rio Python\Project Rio\Reco_env\Scripts\python.exe" "F:\Python\Rio Python\Project Rio\Reco_env\lib\site-packages\pip-19.0.3-py3.8.egg\pip\_vendor\pep517\_in_process.py" build_wheel C:\Users\Rio\AppData\Local\Temp\tmpew_pbwjp:
  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 "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
  Not searching for unused variables given on the command line.
  CMake Error at CMakeLists.txt:2 (PROJECT):
    Generator

      Visual Studio 15 2017

    could not find any instance of Visual Studio.



  -- Configuring incomplete, errors occurred!
  See also "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
  Not searching for unused variables given on the command line.
  -- The C compiler identification is unknown
  CMake Error at CMakeLists.txt:3 (ENABLE_LANGUAGE):
    The CMAKE_C_COMPILER:

      cl

    is not a full path and was not found in the PATH.

    To use the NMake generator with Visual C++, cmake must be run from a shell
    that can use the compiler cl from the command line.  This environment is
    unable to invoke the cl compiler.  To fix this problem, run cmake from the
    Visual Studio Command Prompt (vcvarsall.bat).

    Tell CMake where to find the compiler by setting either the environment
    variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
    the compiler, or to the compiler name if it is in the PATH.


  -- Configuring incomplete, errors occurred!
  See also "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
  See also "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeError.log".
  Not searching for unused variables given on the command line.
  -- The C compiler identification is unknown
  CMake Error at CMakeLists.txt:3 (ENABLE_LANGUAGE):
    The CMAKE_C_COMPILER:

      cl

    is not a full path and was not found in the PATH.

    To use the JOM generator with Visual C++, cmake must be run from a shell
    that can use the compiler cl from the command line.  This environment is
    unable to invoke the cl compiler.  To fix this problem, run cmake from the
    Visual Studio Command Prompt (vcvarsall.bat).

    Tell CMake where to find the compiler by setting either the environment
    variable "CC" or the CMake cache entry CMAKE_C_COMPILER to the full path to
    the compiler, or to the compiler name if it is in the PATH.


  -- Configuring incomplete, errors occurred!
  See also "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeOutput.log".
  See also "C:/Users/Rio/AppData/Local/Temp/pip-install-gyo_26q6/opencv-python/_cmake_test_compile/build/CMakeFiles/CMakeError.log".


  --------------------------------------------------------------------------------
  -- Trying "Ninja (Visual Studio 15 2017 v141)" generator
  --------------------------------
  ---------------------------
  ----------------------
  -----------------
  ------------
  -------
  --
  --
  -------
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  -----------------
  ----------------------
  ---------------------------
  --------------------------------
  -- Trying "Ninja (Visual Studio 15 2017 v141)" generator - failure
  --------------------------------------------------------------------------------



  --------------------------------------------------------------------------------
  -- Trying "Visual Studio 15 2017 v141" generator
  --------------------------------
  ---------------------------
  ----------------------
  -----------------
  ------------
  -------
  --
  --
  -------
  ------------
  -----------------
  ----------------------
  ---------------------------
  --------------------------------
  -- Trying "Visual Studio 15 2017 v141" generator - failure
  --------------------------------------------------------------------------------



  --------------------------------------------------------------------------------
  -- Trying "NMake Makefiles (Visual Studio 15 2017 v141)" generator
  --------------------------------
  ---------------------------
  ----------------------
  -----------------
  ------------
  -------
  --
  --
  -------
  ------------
  -----------------
  ----------------------
  ---------------------------
  --------------------------------
  -- Trying "NMake Makefiles (Visual Studio 15 2017 v141)" generator - failure
  --------------------------------------------------------------------------------



  --------------------------------------------------------------------------------
  -- Trying "NMake Makefiles JOM (Visual Studio 15 2017 v141)" generator
  --------------------------------
  ---------------------------
  ----------------------
  -----------------
  ------------
  -------
  --
  --
  -------
  ------------
  -----------------
  ----------------------
  ---------------------------
  --------------------------------
  -- Trying "NMake Makefiles JOM (Visual Studio 15 2017 v141)" generator - failure
  --------------------------------------------------------------------------------

  ********************************************************************************
  scikit-build could not get a working generator for your system. Aborting build.

  Building windows wheels for Python 3.8 requires Microsoft Visual Studio 2017.
  Get it with "Visual Studio 2017":

    https://visualstudio.microsoft.com/vs/

  ********************************************************************************

  ----------------------------------------
  Failed building wheel for opencv-python
  Running setup.py clean for opencv-python
Failed to build opencv-python
Could not build wheels for opencv-python which use PEP 517 and cannot be installed directly

我还安装了VisualStudioCommunity2019，并尝试了VisualStudioCommunity2017，但问题仍然存在。

有人知道怎么解决这个问题吗？

Answer 1

解决方案: pip3安装--升级pip setuptools轮

Answer 2

安装anaconda .我也有同样的issue...But anaconda只是把它铺好

Answer 3

我认为您的问题正在发生，因为Cmake无法在您的系统路径中找到cl编译器。根据安装的visual studio，尝试找到它，然后添加系统的路径。

这是一个可以找到cl.exe的路径的示例。现在我的是14.0，但你的可能不一样。

C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin