[boost] SVN Ignore for Bin dirs

Is it possible for somebody to add an svn:ignore for dirs like Bin, Stage, Dist, etc on the Boost trunk? Not a big deal, but I pull down Boost using svn:externals for one of my projects, then build it as part of my build script, and it's a little annoying having all the built files pop up in the commit list with no way to set them to ignore without having to do it manually on every checkout. Unless someone knows an SVN trick I can use in my project to work around this? (Though I can't see a reason using svn:ignore in Boost would be a problem...)