arb_clear_buffer_object-null-data: 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/arb_clear_buffer_object-null-data - from package: piglit

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

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