Failed building wheel for opencv-python with error message - No such file or directory: 'scripts/__init__.py'

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1. I have searched related issues but cannot get the expected help.
2. I have read the FAQ documentation but cannot get the expected help.

while building mmcv from source (by using “MMCV_WITH_OPS=1 FORCE_CUDA=1 pip install -e .”) in RHEL Server 7.6, with python 3.7.3, gcc 7.3.0, pytorch 1.7.1 and cuda 10.2, I am encountering an error “ERROR: Could not build wheels for opencv-python, which is required to install pyproject.toml-based projects”. Last few lines of the traceback says -

File "setup.py", line 289, in main
      cmake_source_dir=cmake_source_dir,
    File "/tmp/pip-build-env-_w_vgir1/overlay/lib/python3.7/site-packages/skbuild/setuptools_wrap.py", line 629, in setup
      cmake_source_dir, skbuild_kw['cmake_install_dir'])
    File "setup.py", line 381, in _classify_installed_files_override
      with open('scripts/__init__.py', 'r') as custom_init:
  FileNotFoundError: [Errno 2] No such file or directory: 'scripts/__init__.py'
  ----------------
  ERROR: Failed building wheel for opencv-python

I think this is related to a very recent bugfix in opencv Exactly line 381 in setup.py (where the installation is facing the error in the traceback) has a change in the above commit of opencv. Can you please help?

[dasabir]

Hi @dasabir , is there any progress?

Hi @zhouzaida . Yes, I was just going to post. Finally I could manage to install mmcv. The issue was with the right LD_LIBRARY_PATH and one more env variable CPATH. CPATH was somehow not set. When I exported the cuda/10.2/include path to CPATH and build from source, it compiled successfully. You can close the issue. Thanks a lot for the pointers.

[zhouzaida]

Hi @dasabir , is there any progress?