undefined symbol: svn_fs_revision_root_revision

This is really wierd. I just rebooted my server and all of a sudden
Apache 2.0.45 won't start. It gives the following error:

Syntax error on line 2 of /etc/httpd/conf.d/subversion.conf:
Cannot load /etc/httpd/modules/mod_dav_svn.so into server:
/etc/httpd/modules/mod_dav_svn.so: undefined symbol:
svn_fs_revision_root_revision

It starts fine when it doesn't try to load the above module.

This is on a "production" server and the only change I know I've made was
to update neon from 0.23.5 to 0.23.9. I backed down to 0.23.5 again but
the error remains the same.

What causes this error? I'm now trying to recompile subversion RPM
quickly to get the server back up.

Thanks for any pointers.

-- 
David Wayne Summers          "Linux: Because reboots are for hardware upgrades!"
david_at_summersoft.fay.ar.us   PGP Key: http://summersoft.fay.ar.us/~david/pgp.txt
PGP Key fingerprint =  C0 E0 4F 50 DD A9 B6 2B  60 A1 31 7E D2 28 6D A8 
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