depth-clamp-range: 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-clamp-range - from package: piglit

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

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