Recursive ignore

Although svn:ignore is not recursive by default, is there a way to
give it an expression that will ignore, say, every "bin" directory in
a tree?

eg:
root/sub1/bin
root/sub2/bin
root/sub2/sub21/bin

I'd like to ignore ALL bin subdirectories in this case. Can I do that
other than manually? My directory tree is not fixed, so it gets
unwieldy to add svn:ignore properties with each mkdir.

-- 
Chris R.
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