Since I installed Git through Xcode-tools in my MBP with Mavericks OS X 10.9.2. I am not able to clone a existing repo into my computer. I\'m pretty sure that the problem is in
found this page. thanks author.
http://stuffandymakes.com/2014/03/11/os-x-mavericks-10-9-2-causes-ssl-errors-git-bitbucket/
Open KeyChain app, delete "DigiCert High Assurance CA-*" certificates, then reboot your mac.