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Getting pre-requisites building GCC 4.6.2 on Ubuntu
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This shows you how to get all the pre-requisites as specified
on http://gcc.gnu.org/install/prerequisites.html.

Ubuntu 11.10 or 12.04
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# Easy to get build dependencies for gcc-4.6.x
sudo apt-get build-dep gcc-4.6


Ubuntu 11.04 (and maybe older)
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# As gcc-4.6 is not in the repositories, we need to get the packages manually
sudo apt-get install libgmp3-dev libmpfr-dev libmpc-dev libppl0.11-dev libcloog-ppl-dev

# On some older versions of Ubuntu you might have libppl0.10-dev instead of libppl0.11-dev.


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Doing the full 3-stage build
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In the following: $BUILD stands for build path, $SOURCE for GCC source path,
and $INSTALL stands for GCC installation path. All must be distinct.

:           cd $BUILD
$BUILD:     $SOURCE_D/configure --enable-languages=c --prefix=$INSTALL
$BUILD:     make                # This can take about an hour
$BUILD:     make install