gcc build from source

管理者権限がない場合はlocalにあると何かと便利なので。

http://d.hatena.ne.jp/muupan/20140219/1392823181
http://qiita.com/t_uda/items/080ae8adf924f83d2133

e.g. 
https://gcc.gnu.org/mirrors.html (see release directory)
wget ~~~
tar zxvf gcc-4.9.4.tar.gz
cd gcc-4.9.4/
./contrib/download_prerequisites
mkdir build
cd build
../configure --prefix=$[[HOME]]/local
make
make install