Help, Where I can find proper libtool version?

[易会战 via Gcc]

I am trying to add a library into gcc source code tree. The gcc source have 
used libtool 2.2.7a 1.1334. but I cannot find the version.
So after runing autoreconf and make , I get "libtool: 
Version mismatch error.".It is a curious version, the gnu mirrors 
have no such version.
Thanks a lot!