Failed to install fatal error: opencv2/opencv.hpp: No such file or directory

[PATAPOsha]

Using python 3.6.10 pip install stasm on Ubuntu
Getting following error:

Collecting stasm
  Using cached https://files.pythonhosted.org/packages/32/f5/3d7cecf2b85bb56bf621e434217f62f814c163c938aa199c7db64b6594ee/stasm-2.0.2.tar.gz
Requirement already satisfied: numpy>=1.10 in /home/pata/.pyenv/versions/3.6.10/envs/vk_pic/lib/python3.6/site-packages (from stasm) (1.15.4
)
Installing collected packages: stasm
  Running setup.py install for stasm ... error
    Complete output from command /home/pata/.pyenv/versions/3.6.10/envs/vk_pic/bin/python3.6 -u -c "import setuptools, tokenize;__file__='/t
mp/pip-install-vmhfovj_/stasm/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compi
le(code, __file__, 'exec'))" install --record /tmp/pip-record-ft1fu3in/install-record.txt --single-version-externally-managed --compile --in
stall-headers /home/pata/.pyenv/versions/3.6.10/envs/vk_pic/include/site/python3.6/stasm:
    running install
    running build
    running build_py
    creating build
    creating build/lib.linux-x86_64-3.6
    creating build/lib.linux-x86_64-3.6/stasm
    copying stasm/__init__.py -> build/lib.linux-x86_64-3.6/stasm
    running egg_info
    writing stasm.egg-info/PKG-INFO
    writing dependency_links to stasm.egg-info/dependency_links.txt
    writing requirements to stasm.egg-info/requires.txt
    writing top-level names to stasm.egg-info/top_level.txt
    reading manifest file 'stasm.egg-info/SOURCES.txt'
    reading manifest template 'MANIFEST.in'
    writing manifest file 'stasm.egg-info/SOURCES.txt'
    creating build/lib.linux-x86_64-3.6/stasm/data
    copying stasm/data/README.txt -> build/lib.linux-x86_64-3.6/stasm/data
    copying stasm/data/haarcascade_frontalface_alt2.xml -> build/lib.linux-x86_64-3.6/stasm/data
    copying stasm/data/haarcascade_mcs_lefteye.xml -> build/lib.linux-x86_64-3.6/stasm/data
    copying stasm/data/haarcascade_mcs_righteye.xml -> build/lib.linux-x86_64-3.6/stasm/data
    copying stasm/data/testface.jpg -> build/lib.linux-x86_64-3.6/stasm/data
    running build_ext
    building '_stasm' extension
    creating build/temp.linux-x86_64-3.6
    creating build/temp.linux-x86_64-3.6/src
    creating build/temp.linux-x86_64-3.6/src/MOD_1
    gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -fPIC -I/usr/local/include -I/usr/local/Cellar/opencv/3.4.1
_5/include -I/usr/local/include/opencv4 -I/home/pata/.pyenv/versions/3.6.10/envs/vk_pic/include -I/home/pata/.pyenv/versions/3.6.10/include/
python3.6m -I/home/pata/.pyenv/versions/3.6.10/envs/vk_pic/lib/python3.6/site-packages/numpy/core/include -c src/asm.cpp -o build/temp.linux
-x86_64-3.6/src/asm.o
    In file included from src/asm.cpp:5:0:
    src/stasm.h:33:10: fatal error: opencv2/opencv.hpp: No such file or directory
     #include "opencv2/opencv.hpp"
              ^~~~~~~~~~~~~~~~~~~~
    compilation terminated.
    error: command 'gcc' failed with exit status 1

    ----------------------------------------

cv2 is installed and imported succesffully:

(vk_pic) pata@pata_pc:/mnt/c/Users/pata/PycharmProjects/test$ python
Python 3.6.10 (default, Apr 16 2020, 14:35:54)
[GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
>>> cv2.__version__
'3.4.5'
>>>

[dmnc-net]

Arch Linux
Python 3.9.1
pip 21.0.1
opencv-python 4.5.1.48
... same result (file not found)

[dmnc-net]

#4 same error under MacOS env.

[github-BR-admin]

MacOS, same issue here. Additional info, brew seems to install cv2 in a different location ... /opt/homebrew/opt/opencv@3.