Created attachment 312385 [details] /var/tmp/portage/dev-util/kbuild-0.1.9998_pre20110817/temp/autoconf-1.out When trying to emerge dev-util/kbuild-0.1.9998_pre20110817 autoconf fails: "Failed Running autoconf !"
Created attachment 312387 [details] build.log
Created attachment 312389 [details] emerge --info
Same issue here; on Gentoo Hardened while trying to emerge virtualbox
This is most likely fixed by the recent changes in autotools-utils.eclass, "emerge --sync" then try again
After emerge --sync to day it's ok.
As in comment 5, emerge --sync today did the trick.