On a CentOS 6 server, when cloning repo from GIT, i got following error
root@server48 [~]# git clone https://github.com/gmarik/vundle ~/.vim/bundle/vundle
Cloning into /root/.vim/bundle/vundle...
fatal: Unable to find remote helper for 'https'
root@server48 [~]#
This is because git was installed from source and compiled with out SSL support. You need to install openssl-devel package, then recompile git if you are installing from source.
Since CentOS have GIT available in yum repo, it is better install GIT via yum.
yum install git
On Ubuntu/Debian
apt-get install git