gtklick: command not found

Have You tried accessing the binary with the full path?

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/gtklick - from package: gtklick

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