gplib: 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/gplib - from package: gputils

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

On Debian possible default full paths are:

/usr/bin/gplib - from package: gputils

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

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