flite_time: command not found

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 CentOS possible default full paths are:

/usr/bin/flite_time - from package: flite

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/flite_time - from package: flite

You may install the required package with command apt-get install {package}

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