macpack: 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/macpack - from package: mono-devel

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

On Debian possible default full paths are:

/usr/bin/macpack - from package: mono-devel

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

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