svnsync through proxy?

I have svnsync set up to keep local backup copies of some offsite
development work, but recently the network firewalling has changed so
this server can't reach the targets without using a proxy. The target
URL's are http://. Is there a way to tell svnsync to use an http proxy?
It doesn't seem to observe the standard http_proxy= environment setting
unless I've done something wrong.

-- 
   Les Mikesell
    lesmikesell_at_gmail.com
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