A stupid attempt at writing a program that will simply shell out and call 'say' on OSX as soon as the LCM broadcast packet is received.
Take five minutes and do the following...
Install the XCode Command Line Tools
xcode-select --install
Install Homebrew
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
Install pkg-config
brew install pkg-config
Install LCM
brew install lcm
Generate the message marshalling code
pushd src
lcm-gen -c say.lcm
popd
Run the magic incantation
make
make install