rpm -Uvh http://rbel.co/rbel62. Install rubygems
yum install rubygems parted e2fsprogs ruby-libguestfs \
febootstrap rsync wget util-linux yum-utils \
ruby-devel gcc make libxml2-devel libxslt-devel \
appliance-tools git rpmdevtools createrepo \
guestfish
This will pull the required deps.
3. Install boxgrinder and plugins
gem install –no-ri –no-rdoc boxgrinder-build
Done!