opentool: 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/opentool - from package: gnustep-make

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

On Debian possible default full paths are:

/usr/bin/opentool - from package: gnustep-common

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

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