When I tried to emerge libtool as part of "emerge system" on x86_64, I've got the following error : Invalid configuration 'x86_64-pc-linux-gnu' : machine type 'x86_64-pc' not recognized. Reproducible: Always Steps to Reproduce: 1. Get amd64 box 2. Start Gentoo installation Stage 1 or 2 3. emerge system As I figured out, the problem is in file configure.sub in package libtool-1.3.5.tar.gz(which is part of libtool-1.5.2-r5 ebuild), it does not support x86_64 architecture. I've fixed it by using configure.sub from another package, in case gcc-3.3, which I previously compiled successfully.
*** This bug has been marked as a duplicate of 57224 ***