depth-tex-modes-rg: 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/lib64/piglit/bin/depth-tex-modes-rg - from package: piglit

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

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