guile: OSX users should use gcc to compile guile

If you use homebrew - see https://gist.githubusercontent.com/alghanmi/8853646/raw/gcc-default-fix.sh

	#
	# Make gcc-4.8 the default compiler
	#	brew installs gcc-4.8, but does not create symlinks for it to be used
	#	without the version number.
	#	This script:
	#		1. Generate symlinks for all gcc tools installed by brew
	#		2. Make brew-installed software the first in path
	#

	BREW_CMD="brew"
	BREW_BIN="$(brew --prefix)/bin"
	LN_APPS="c++-4.8 cpp-4.8 g++-4.8 gcc-4.8 gcc-ar-4.8 gcc-nm-4.8 gcc-ranlib-4.8 gcov-4.8"
	OLD_PWD=$(PWD)

	#Make sure brew is installed
	type -P $BREW_CMD &>/dev/null || { echo "$BREW_CMD is not installed."; exit 1; }

	#Generate Symlinks
	cd $BREW_BIN
	for app in $LN_APPS
	do
		LN_NAME=$(echo $app | sed 's/\(.*\)-4.8/\1/')
		ln -s $app $LN_NAME
	done

	#Prepend brew's path to $PATH
	echo '#Making brew apps the first in your path' >> ~/.bash_profile
	echo 'PATH=$(brew --prefix)/bin:$PATH' >> ~/.bash_profile

	cd $OLD_PWD