Howdy,
As far as I know, the original espeak project has been abandoned. I have heard the original developer passed away, but I can not confirm that one way or the other.
The latest developments have been added under a fork of the project called Espeak-ng: https://github.com/espeak-ng/espeak-ng
This new fork has a lot of improvements and pronounciation fixes. i wonder if it shouldn't be the one in the official repos now.
Thanks Storm
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