flite-go 
Golang bindings for Flite (festival-lite)
Requirements
Ubuntu
apt-get install flite-dev
Fedora
dnf install flite-devel
Installation
go get -v github.com/gen2brain/flite-go
Example
package main
import "github.com/gen2brain/flite-go"
func main() {
// The valid names are "awb", "kal16", "kal", "rms" and "slt"
voice, err := flite.VoiceSelect("kal")
if err != nil {
panic(err)
}
// Use "play" for output and it will be sent to the audio device
flite.TextToSpeech("Hello World", voice, "output.wav")
}