"most recent" ?
the glibc headers ship with glibc, yes? I installed glibc-2.3.5 on the machine less than an hour ago.
Did I modify the original headers? No. I got the tarball from my gentoo machine, and same goes for the linuxthreads add-on. I'm pretty sure that's not modified though; it's as is. Gentoo leaves any patches/modifications it makes as ... patches.
