bundlebuilder it's the part of sugar that manipulates .xo bundles (.zip files for activities)
and it needs git that it is not installed by default.
so all you have to do is:
yum install git
then vi . (installed by default on the XO). Emacs or another editor and possibly in a near future an activity like develop  (still unfinished)
or similar allowing to have a python-IDE inside sugar