fatal: unable to access 'https://gitlab.operasolutions.com/poc/jpm-demo.git/': SSL certificate problem: unable to get local issuer certificate

C++
# in unix put this in your .bash_profile, while
# in windows put it in a batch script that runs at startup or
# simply run it before cloning the repo
git config --global http.sslVerify false
Source

Also in C++: