Proper URI for "svn clone" on a network share (Win32)

I've been sparring with the proper syntax and hope someone can give me the magic I'm missing. I want to do something of the form

  c:\temp> git svn clone "file:///x:/path/to/repo/trunk/utils/project1"

but get various failures. My best-effort (above) gets me as far as actually starting some sort of clone but it dies with

""" Permission denied: Can't open '/tmp/report.tmp': Permission denied at /usr/lib/perl5/site_perl/Git/SVN.pm line 1210 """

If it makes any difference, this is within a cmd.exe shell (with $PATH set appropriately so git is being found).

Am I missing something in the URL syntax to get it to clone my svn repo with less drama?

-tkc

PS: I don't really care much about pushing back to svn, existing
svn branches or tags, or username mapping.  If needed, I can apply
patches out of git which is far less painful than switching/merging
branches in svn.  So I can be a little rough-shod with cloning the
svn repo.

PPS: in case it matters:
C:\work\utils\temp\ios>git version
git version 1.8.3.msysgit.0

.