Build GCC 4.9.3 on a Raspberry Pi 2b running Raspian 2015-05-05

gistfile1.txt

sudo apt-get install libmpc-dev
sudo apt-get install libmpfr-dev
sudo apt-get install libgmp-dev

export LDFLAGS='-L/usr/lib/arm-linux-gnueabihf/ -L/usr/lib/gcc/arm-linux-gnueabihf/4.6/'
export CFLAGS='-I/usr/include/arm-linux-gnueabihf/ -mfloat-abi=hard '${LDFLAGS}
export CXXFLAGS=${CFLAGS}
export CPPFLAGS=${CFLAGS}

sudo ln -s /usr/lib/arm-linux-gnueabihf/crti.o /usr/lib
sudo ln -s /usr/lib/arm-linux-gnueabihf/crtn.o /usr/lib
sudo ln -s /usr/lib/arm-linux-gnueabihf/crt1.o /usr/lib

cd ~/Downloads
curl ftp://ftp.mirrorservice.org/sites/sourceware.org/pub/gcc/releases/gcc-4.9.3/gcc-4.9.3.tar.bz2 -O
tar xvfj gcc-4.9.3.tar.bz2

cd gcc-4.9.3
./configure --disable-multilib --enable-languages=c,c++ --program-suffix=-4.9
make -j 2
sudo make install

Works for me!! However will take hours to compile, link and install!