So, yah, I need Raspberry Pi TTS voices.... I thought that was understood by me being on the Raspberry Pi forums, guess that guy didn't quite get the memo?
so he may have had a mac but because you may have assumed right does not mean the behaviour is correct. and statistically you will be wrong as often as you are right
two things that may hel would be to ask yourself what else is going on here (that is where comments come in you could have verified your assumtion re having a mac)