libedit-13-osx-10.6.3.tar.gz is the version that Apple ships with 10.6.3:

http://www.opensource.apple.com/source/libedit/libedit-13/

fetch NetBSD libedit sources (authoritative source):

$> export CVS_RSH="ssh" $> export CVSROOT="[email protected]:/cvsroot" $> cvs checkout -P src/lib/libedit