gclose: 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/gclose - from package: gnustep-gui

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

On Debian possible default full paths are:

/usr/bin/gclose - from package: gnustep-gui-runtime

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

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