Using https://gist.github.com/eddarmitage/2001099
wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm
sudo su
rpm --import http://apt.sw.be/RPM-GPG-KEY.dag.txt
rpm -K rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm
rpm -i rpmforge-release-0.5.2-2.el5.rf.x86_64.rpm
yum install libcurl libcurl-devel
yum install git-gui