Text to Speech on Mac OSX

Al ejecutar el Script en Mac OSX, salta el problema:

Jorge:Desktop jorge$ ./t2s.sh es Este es un texto muy interesante para convertir.
/*_____________________________________________
---------------------------
Speech Script by Dan Fountain
TalkToDanF@gmail.com
---------------------------
Playing line: 1 of 1
./t2s.sh: line 38: mpg123: command not found
_____________________________________________*/

Haciendo una pequeña modificación en el Scrip, podemos reproducir el T2S con VLC añadiendo la siguiente línea:
/Applications/VLC.app/Contents/MacOS/VLC

El Script quedaría así:

#!/bin/bash

#################################
# Speech Script by Dan Fountain #
# Modified by Pablo Castagnino  #
# TalkToDanF@gmail.com          #
#################################

INPUT=$*
STRINGNUM=0

ary=(${INPUT:2})
echo "---------------------------"
echo "Speech Script by Dan Fountain"
echo "TalkToDanF@gmail.com"
echo "---------------------------"
for key in "${!ary[@]}"
do
SHORTTMP[$STRINGNUM]="${SHORTTMP[$STRINGNUM]} ${ary[$key]}"
LENGTH=$(echo ${#SHORTTMP[$STRINGNUM]})
#echo "word:$key, ${ary[$key]}"
#echo "adding to: $STRINGNUM"
if [[ "$LENGTH" -lt "100" ]]; then
#echo starting new line
SHORT[$STRINGNUM]=${SHORTTMP[$STRINGNUM]}
else
STRINGNUM=$(($STRINGNUM+1))
SHORTTMP[$STRINGNUM]="${ary[$key]}"
SHORT[$STRINGNUM]="${ary[$key]}"
fi
done

for key in "${!SHORT[@]}"
do
#echo "line: $key is: ${SHORT[$key]}"

echo "Playing line: $(($key+1)) of $(($STRINGNUM+1))"
/Applications/VLC.app/Contents/MacOS/VLC "http://translate.google.com/translate_tts?tl=${1}&q=${SHORT[$key]}"
done