Install Pear with MAMP Mac osx
Really easy. In your .profile file modify your PATH variable to look like this:
export PATH="/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/sw/bin:/Applications/MAMP/Library/bin:/Applications/MAMP/bin/php5/bin"
PS: if .profile does not exist create it in your home!!!!