Here are the steps to compile and build the Git RPMs using the git.spec
provided by the project:
wget http://kernel.org/pub/software/scm/git/git-2.8.1.tar.gz -P ~/rpmbuild/SOURCES
tar xf ~/rpmbuild/SOURCES/git-2.8.1.tar.gz
cp git-2.8.1/git.spec ~/rpmbuild/SPECS
rm -fr git-2.8.1
# install all dependencies (e.g. yum install -y)