Install libespeak-dev by entering the following commands in the terminal:
sudo apt update sudo apt install libespeak-dev
Description:
Multi-lingual software speech synthesizer: development files
eSpeak is a software speech synthesizer for English, and some other languages. . This package contains the eSpeak development files needed to build against the espeak shared library.
Homepage: http://espeak.sourceforge.net/
Version: 1.48.04+dfsg-5
Section: universe/libdevel