Description won't tell you more than build.log.
Created attachment 163091 [details] build.log
These lines: rm: cannot remove `conftest*': No such file or directory appear cause most test expect RM='rm -f' and here it's simply set to RM=rm. /bin/sh: ./libtool: No such file or directory error is due to the fact that libtool 2 creates libtool with configure.status, not right after the macro. But the final lines are strange, cause those files do exist.
Actually, I think those libtool tests can be done without generating libtool, simly by directly testing correct variables.
emerge --info please!
OK, this is mostly invalid. I got hit by bug 217976, with autoconf-2.62-r1 it works. The RM and libtool related errors are still there, but if you don't consider them bugs... Anyway, thanks for your help.
Ok, if anybody else hits this I can add "!=sys-devel/autoconf-2.62", but I don't think that's really needed anymore.