Howto build a rust compiler for the Raspberry Pi on Debian 7.1 (wheezy)
sudo apt-get install git build-essential
test `uname -m` = x86_64 && sudo apt-get install ia32-libs
git clone https://github.com/raspberrypi/tools.git
export PATH=$PWD/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin:$PATH
git clone http://github.com/mozilla/rust.git
cd rust
./configure --target-triples=arm-unknown-linux-gnueabihf
make