sudo apt-get build-dep gcc-4.7

export src_dir=~/devel/gcc/src
export build_dir=~/devel/gcc/build
mkdir -p ${build_dir}/install
mkdir -p ${build_dir}/objs

cd ${src_dir}/..
git clone git://gcc.gnu.org/git/gcc.git src

cd ${src_dir}
./contrib/gcc_update --touch
./contrib/download_prerequisites
export target=`./config.guess`

cd ${build_dir}/objs
export dpkg_arch=`dpkg-architecture -qDEB_HOST_MULTIARCH`
export LIBRARY_PATH=/usr/lib/${dpkg_arch}

${src_dir}/configure \
  --target=${target} --host=${target} --build=${target} \
  --prefix=${build_dir}/install \
  --enable-languages=c,c++,fortran \

export parallelism="-j2 -l2"
make ${parallelism} && echo Success
make ${parallelism} install && echo Success
make ${parallelism} -k check