Install gcc-4.9.1 in OSX

[Buttonwood]

'''
mkdir tmp

gmp

wget https://gmplib.org/download/gmp/gmp-6.0.0a.tar.bz2
tar -xjf gmp-6.0.0a.tar.bz2
cd gmp-6.0.0
mkdir build && cd build
../configure --prefix=/usr/bin/gcc-4.9.1 --enable-cxx
make -j 8
sudo make install
cd ../../

mpfr

wget http://www.mpfr.org/mpfr-current/mpfr-3.1.2.tar.gz
tar -xvzf mpfr-3.1.2.tar.gz && cd mpfr-3.1.2
mkdir build && cd build
../configure --prefix=/usr/bin/gcc-4.9.1 --with-gmp=/usr/bin/gcc-4.9.1
make -j 8
sudo make install
cd ../../

mpc

wget ftp://ftp.gnu.org/gnu/mpc/mpc-1.0.2.tar.gz
tar -xvzf mpc-1.0.2.tar.gz && cd mpc-1.0.2
mkdir build && cd build
../configure --prefix=/usr/bin/gcc-4.9.1 --with-gmp=/usr/bin/gcc-4.9.1 --with-mpfr=/usr/bin/gcc-4.9.1
make -j 8
sudo make install
cd ../../

isl

wget ftp://gcc.gnu.org/pub/gcc/infrastructure/isl-0.12.2.tar.bz2
tar -xjf isl-0.12.2.tar.bz2 && cd isl-0.12.2
mkdir build && cd build
../configure --prefix=/usr/bin/gcc-4.9.1 --with-gmp-prefix=/usr/bin/gcc-4.9.1
make -j 4
sudo make install
cd ../../

cloog

wget ftp://gcc.gnu.org/pub/gcc/infrastructure/cloog-0.18.1.tar.gz
tar -xvzf cloog-0.18.1.tar.gz && cd cloog-0.18.1
mkdir build && cd build
../configure --prefix=/usr/bin/gcc-4.9.1 --with-gmp-prefix=/usr/bin/gcc-4.9.1 --with-isl-prefix=/usr/bin/gcc-4.9.1
make -j 8
sudo make install
cd ../../

gcc

wget http://gcc.skazkaforyou.com/releases/gcc-4.9.1/gcc-4.9.1.tar.gz
tar -xvzf gcc-4.9.1.tar.gz && cd gcc-4.9.1

./contrib/download_prerequisites

sudo ./configure --program-suffix=-4.9.1

mkdir build && cd build
../configure --prefix=/usr/bin/gcc-4.9.1 --enable-checking=release --with-gmp=/usr/bin/gcc-4.9.1 --with-mpfr=/usr/bin/gcc-4.9.1 --with-mpc=/usr/bin/gcc-4.9.1 --with-isl=/usr/bin/gcc-4.9.1 --with-cloog=/usr/bin/gcc-4.9.1 --program-suffix=-4.9.1 --enable-languages=c,c++,fortran
make -j 16
sudo make install
'''

https://solarianprogrammer.com/2013/06/11/compiling-gcc-mac-os-x/