git clone : error: server certificate verification failed.

I got

"error: server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none while accessing https://github.com/mrobinson/webkit.git/info/refs"

I just want to make 'git clone' with https for private git in github.

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then I did it....just SSL_NO_VERIFY..........

export GIT_SSL_NO_VERIFY=1