fsck.ext3: Filesystem has unsupported feature(s) (/boot)

[Duncan Lithgow]

I found this post with one way of fixing my problem:

http://ubuntuforums.org/showthread.php?t=48204&highlight=fsck.ext3

... where it says: " I just replaced the ubuntu fsck.ext3 with CentOS 4 
version and all was OK."

Does this mean that I jusy replace "fsck.ext3" in /sbin, or is there 
more to it. I don't want to just go ahead and try - might f*ck my system

Duncan