khr_debug-object-label_gl: 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/khr_debug-object-label_gl - from package: piglit

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

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