Hotfix patches are available to fix Boost.Filesystem and Boost.Xpressive [1.36.0] problems. See http://svn.boost.org/trac/boost/wiki/ReleasePractices/HotFixes Providing hotfix patches is something new and experimental for Boost. Please let us know on the users or developers mailing list if you find the patches useful or have other comments. Thanks, --Beman