pack: 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/pack - from package: liballegro4-dev

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

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