arb_clear_buffer_object-invalid-size: 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-invalid-size - from package: piglit

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

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