gbklatex: 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/gbklatex - from package: texlive-east-asian

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

On Debian possible default full paths are:

/usr/bin/gbklatex - from package: latex-cjk-chinese

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

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