Diz logo na sua saída:
** The 'pear' command is not currently in your PATH, so you need to
** use '/Users/Mike/pear/bin/pear' until you have added
** '/Users/Mike/pear/bin' to your PATH environment variable.
Para adicionar o comando fornecido ao seu PATH
, adicione export PATH=$PATH:/Users/Mike/pear/bin/pear
ao seu ~/.bashrc
.