/usr/bin/GSSpeechServer is in gnustep-gui-runtime 0.20.0-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/bin/../lib/GNUstep/Applications/GSSpeechServer.app/GSSpeechServer
/usr/bin/../lib/GNUstep/Applications/GSSpeechServer.app/GSSpeechServer