[Problem Solving] How to solve the problem of getting stuck in the installation of IPPICV package when installing opencv on Linux

When installing the opencv4.1.0 library on Linux, I have been stuck here:

-- Performing Test HAVE_CXX_WNO_IMPLICIT_FALLTHROUGH
-- Performing Test HAVE_CXX_WNO_IMPLICIT_FALLTHROUGH - Success
-- Performing Test HAVE_CXX_WNO_CLASS_MEMACCESS
-- Performing Test HAVE_CXX_WNO_CLASS_MEMACCESS - Success
-- Checking for module 'gtk+-3.0'
--   No package 'gtk+-3.0' found
-- Checking for module 'gtk+-2.0'
--   Found gtk+-2.0, version 2.24.32
-- Checking for module 'gthread-2.0'
--   Found gthread-2.0, version 2.64.6
-- IPPICV: Download: ippicv_2019_lnx_intel64_general_20180723.tgz

Mainly because the ippicv package cannot be downloaded, so we can use manual download:

wget https://raw.githubusercontent.com/opencv/opencv_3rdparty/32e315a5b106a7b89dbed51c28f8120a48b368b4/ippicv/ippicv_2019_lnx_intel64_general_20180723.tgz

After downloading, place this ippicv_2019_lnx_intel64_general_20180723.tgz in your own directory, such as: user/xxx/opencv/ippicv_2019_lnx_intel64_general_20180723.tgz

Then find line 47 here opencv-x.x.x\3rdparty\ippicv\ippicv.cmake

"https://raw.githubusercontent.com/opencv/opencv_3rdparty/${IPPICV_COMMIT}/ippicv/"

Modify as follows. Note that this is the path where you put the ippicv installation package:

user/xxx/opencv/

Then reinstall opencv.