How are “errata” patches different from what is in the CVS tree?
All patches posted to the errata web page are patches directly against the indicated release’s source tree. Patches against the latest CVS tree might also include other changes that wouldn’t be wanted on a release system. This is important: If you have installed a snapshot, checked out the source trees at the time you obtained that snapshot and attempt to patch it using a published patch, you may well find the patch doesn’t apply, as that code may have changed.