rusty-fuzzy.diff inside the 2.6.2 tarball was most likely created without the '-N' option to diff. It references and requires a file called "alternate.c" which isn't available in original rsync, it should be provided by this patch, but it isn't. This file can be fetched from rsync-fuzzy.diff from older (2.5.x) versions of rsync.
Added missing content back to the patch in CVS. Renamed patch fuzzy.diff.