luajittex: 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 Debian possible default full paths are:

/usr/bin/luajittex - from package: texlive-binaries

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

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