opencv-python 4.7.0.68 wheels does not solve the zlib issue

[epeisach]

Expected behaviour

import cv2

should work

Actual behaviour

import cv2
Traceback (most recent call last):
File "", line 1, in
File "/wwpdb_da/da_top/wwpdb_python/lib/python3.8/site-packages/cv2/init.py", line 181, in
bootstrap()
File "/wwpdb_da/da_top/wwpdb_python/lib/python3.8/site-packages/cv2/init.py", line 153, in bootstrap
native_module = importlib.import_module("cv2")
File "/wwpdb_da/da_top/tools/lib/python3.8/importlib/init.py", line 127, in import_module
return _bootstrap._gcd_import(name[level:], package, level)
ImportError: /lib64/libz.so.1: version `ZLIB_1.2.9' not found (required by /data/wwpdb_da/da_top/wwpdb_python/lib/python3.8/site-packages/cv2/../opencv_python.libs/libpng16-186fce2e.so.16.37.0)

Steps to reproduce

Centos-7 O/S
Compiled python 3.8
pip install python-opencv

python
import cv2

Issue submission checklist

• This is not a generic OpenCV usage question (looking for help for coding, other usage questions, homework etc.)
• I have read the README of this repository and understand that this repository provides only an automated build toolchain for OpenCV Python packages (there is no actual OpenCV code here)
• The issue is related to the build scripts in this repository, to the pre-built binaries or is a feature request (such as "please enable this additional dependency")
• I'm using the latest version of opencv-python

[wqh17101]

@epeisach dumplicate #772

[wqh17101]

The reason it that there is no zlib >=1.2.9 in you system.