[gentoo-amd64] Building vanilla gcc fails, any ideas?

[Jack Lloyd <lloyd@randombit.net>]

Trying to build a gcc 4.3 snapshot (20080125) fails on my x86-64
box. While building libstdc++, I see many problems with various libc
functions not being found, for instance

gcc-4.3-20080125-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/cstdio:140: error: '::ungetc' has not been declared

I assume this has something to do with Gentoo's multilib header setup
but I'm not sure what extra paths I should be configuring the build to
search for. This snapshot is supposed to be stable (4.3 is in stage3
currently and from the reports on the mailing list is building well on
other platforms). Currently I'm configuring with

../gcc-4.3-20080125/configure --enable-languages=c,c++,objc,obj-c++ --prefix=/usr/local/gcc-4.3-20080125 --program-suffix=-4.3-20080125

Any hints?

Jack
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