Questions about how to use git

[Kai YU]

     Hi, I'm currently investigating how to fight software regressions with
git bisect. Particularly, I want to use git bisect to help locate the
#Bug12181 (http://savannah.gnu.org/bugs/?12181). However, when I use "git
checkout FINDUTILS_4_2_18-1" to switch to the version 4.2.18, it fails to
compile. Moreover, I noticed that FINDUTILS_4_2_18-1.tar.gz (from
http://git.savannah.gnu.org/cgit/findutils.git/snapshot/FINDUTILS_4_2_18-1.tar.gz)
is different from findutils-4.2.18.tar.gz (from
http://ftp.gnu.org/gnu/findutils/findutils-4.2.18.tar.gz). My question is,
how to get the code of findutils 4.2.18 (which can be successfully compiled)
by git automatically?

Looking forward to your reply,