GSSpeechServer: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/GSSpeechServer - from package: gnustep-gui-runtime

You may install the required package with command apt-get install {package}
Error in other languages:
GSSpeechServer: bevel nie gevind nie
GSSpeechServer: comandă negăsită
GSSpeechServer: comando não encontrado
GSSpeechServer: commande introuvable
GSSpeechServer: command not found
GSSpeechServer: käsku ei ole
GSSpeechServer: không tìm thấy lệnh
GSSpeechServer: komanda nerasta
GSSpeechServer: Kommando nicht gefunden.
GSSpeechServer: kommandot finns inte
GSSpeechServer: komut yok
GSSpeechServer: nie znaleziono polecenia
GSSpeechServer: níor aimsíodh an t-ordú
GSSpeechServer: no se encontró la orden
GSSpeechServer: no s'ha trobat l'ordre
GSSpeechServer: opdracht niet gevonden
GSSpeechServer: parancs nem található
GSSpeechServer: perintah tidak ditemukan
GSSpeechServer: príkaz nenájdený
GSSpeechServer: příkaz nenalezen
GSSpeechServer: команда не найдена
GSSpeechServer: командата не е открита
GSSpeechServer: 命令找不到
GSSpeechServer: コマンドが見つかりません