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

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

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