https://download.qt.io/online/qtsdkrepository/windows_x86/desktop/qt5_597/qt.qt5.597.qtspeech.win64_msvc2013_64/
Index of /online/qtsdkrepository/windows_x86/desktop/qt5_597/qt.qt5.597.qtspeech.win64_msvc2013_64
https://ports.macports.org/port/qt513-qtspeech-docs/
Install qt513-qtspeech-docs on macOS with MacPorts
on macosinstalldocsmacports
https://nixsoftware.org/en/packages/qt5-qtspeech
Install Qtspeech on Linux | Nix Software
Cross-platform application framework for C++
on linuxinstallnixsoftware