[plt-dev] Racket "make install" error when installing from svn mirror

I checked out Racket from the github SVN mirror 
(http://svn.github.com/plt/racket), and received the following error 
from "make install" when attempting to make an in-place installation:

raco setup: --- installing collections ---
raco setup: --- post-installing collections ---
raco setup: post-installing: help
raco setup: post-installing: mred
raco setup: post-installing: mysterx
raco setup: post-installing: mzcom
raco setup: post-installing: mzscheme
raco setup: post-installing: racket/gui
raco setup: done
raco setup:
raco setup: error: during Early Install for plot
raco setup:   plot-preinstaller: Found an unknown source directory: 
#<path:.svn>

make[1]: *** [install-3m] Error 1
make[1]: Leaving directory `/home/brian/Sources/racket-20100526/src/build'
make: *** [install] Error 2

Any ideas?
-- 
Brian Mastenbrook
brian at mastenbrook.net
http://brian.mastenbrook.net/