how to prevent svnlite write large files under /tmp on arm?

[Anton Shterenlikht]

I'm trying to pull the ports tree with svnlite.
svnlite creates a file under /tmp that grows
bigger than /tmp, which is 30MB in the
default install on armv6 freebsd10.1,
Then svnlite crashes. I can increase the
size of /tmp, but I wonder if I can tell
svnlite not to write anyting under /tmp.
Can this be specified via flags to svnlite?

Thanks
Anton