gclock: 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/gclock - from package: ivtools-bin

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

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