That's how we do it in Fedora 24:
$ echo hello | festival --tts
Segmentation fault (core dumped)
$ echo hello | festival --tts
Segmentation fault (core dumped)
Permalink: https://plus.google.com/115290581164606462017/posts/DfE14jjLF4c
Permalink: https://plus.google.com/115290581164606462017/posts/DfE14jjLF4c