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If you have not made any deliberate changes to your checked out sources you may nevertheless have some local changes, eg when autoconf and friends get invoked automatically because of timestamp issues. Or you may have done autogen.sh to make all config files locally. If you want to be 100% back in step with the master copy at sourceforge and are CERTAIN you have not made any local valuable changes, then
svn -R revert .
unwinds anthing that subversion sees as a local change. Then "svn update" should bring you totally back in step.
I put this posting because as a bit of a newcomer to subversion I need to remind myself.