On trunk, we renamed libsvn_ra_dav to libsvn_ra_neon. This has no compatibility issues for Subversion's core programs, which already do version number checks against the libraries. And third-party programs shouldn't be linking to libsvn_ra_dav, which has no public API, but just to libsvn_ra. However, they may be some problems where some libtools build third-party programs with -lsvn_ra_dav anyway. I do not fully understand the issues involved; Peter Samuelson described some of them here: http://svn.haxx.se/dev/archive-2007-06/0534.shtml We should make sure the situation is acceptable before releasing 1.5.