Created attachment 411918 [details, diff] Patch for autotools.eclass autotools.eclass currently depends on =autoconf-2.1* if WANT_AUTOCONF is equal to 2.1. This is one of the only two instances in the tree where the * operator is used to match a string prefix (and not a range of version components). See discussion in bug 560466 and in the -dev ML. I guess it's unlikely that we will see further upstream versions of autoconf 2.1, so the eclass could simply depend on ~autoconf-2.13 instead. Patch is attached.
looks fine
https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=ea03408c083647a575ee5e256b6ce73e556fcca5