How to install gcc-4.X on Mac OSX 10.7.X

1. Uninstall MacPort

$> sudo port -fp uninstall installed
--https://guide.macports.org/chunked/installing.macports.uninstalling.html
This is needed to install some package with Brew - Qt for example.
Otherwise you will get this error :

==> make
1 error generated.
make[1]: *** [sipQtCoreQAbstractFileEngine.o] Error 1
1 error generated.
make[1]: *** [sipQtCorecmodule.o] Error 1
make: *** [sub-QtCore-make_default-ordered] Error 2
Warning: It appears you have MacPorts or Fink installed.
Software installed with other package managers causes known problems for
Homebrew. If a formula fails to build, uninstall MacPorts/Fink and try again.

2. Install homebrew

3. Install GCC4.8

brew tap homebrew/versions
brew install [flags] gcc48

You can view available install flags by using

brew options gcc48

http://afni.nimh.nih.gov/pub/dist/HOWTO/howto/ht00_inst/html/mac_10.78_uber.html   Switch gcc version  to gcc-4.8 cd /usr/bin rm cc gcc c++ g++ ln -s gcc-4.8 cc ln -s gcc-4.8 gcc ln -s c++-4.8 c++ ln -s g++-4.8 g++ Revert back gcc to llvm-gcc

sudo rm cc gcc c++ g++
sudo ln -s lvm-gcc-4.2 cc
sudo ln -s lvm-cc-4.2 gcc
sudo ln -s lvm-c++-4.2 c++
sudo ln -s lvm-g++-4.2 g++

fatal error: stdlib.h: No such file or directory

Note, XCode and Command-line Tools are to be downloaded here https://developer.apple.com/downloads/index.action?q=xcode

Upgrade nasm :

$> brew install nasm
$> cd /usr/bin
$> sudo mv nasm nasm.old
$> sudo ln -s /usr/local/Cellar/nasm/2.11.06/bin/nasm nasm