Background
Windows
Based on these posts and on this recommended post.
You should install msysgit, to do the checkout.
md C:\relax cd C:\relax
To clone from a revision number, use -r NR. This will tell which revision to start taking history from. If you want to include all of the history, just leave that option off, but it will take a very long time, and you really don't need all of it. The older a revision you choose, the longer it will take to import. But you will not be able to "git blame" past the earliest revision you import.
git svn clone http://svn.gna.org/svn/relax/trunk git svn clone -r 20000:HEAD http://svn.gna.org/svn/relax/trunk
git svn clone http://svn.gna.org/svn/relax/branches/relax_disp git svn clone -r 20000:HEAD http://svn.gna.org/svn/relax/branches/relax_disp
#Build scons
For futurev updates to the SVN revision HEAD, you now need to do a git svn rebase, which is very similar to: svn up
git svn rebase
Check information
git branch -a