gmac: 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/gmac - from package: tkgate

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

On Debian possible default full paths are:

/usr/bin/gmac - from package: tkgate

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

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