arb_es2_compatibility-drawbuffers: 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_es2_compatibility-drawbuffers - from package: piglit

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

Error in other languages:
arb_es2_compatibility-drawbuffers: bevel nie gevind nie
arb_es2_compatibility-drawbuffers: comandă negăsită
arb_es2_compatibility-drawbuffers: comando não encontrado
arb_es2_compatibility-drawbuffers: commande introuvable
arb_es2_compatibility-drawbuffers: command not found
arb_es2_compatibility-drawbuffers: käsku ei ole
arb_es2_compatibility-drawbuffers: không tìm thấy lệnh
arb_es2_compatibility-drawbuffers: komanda nerasta
arb_es2_compatibility-drawbuffers: Kommando nicht gefunden.
arb_es2_compatibility-drawbuffers: kommandot finns inte
arb_es2_compatibility-drawbuffers: komut yok
arb_es2_compatibility-drawbuffers: nie znaleziono polecenia
arb_es2_compatibility-drawbuffers: níor aimsíodh an t-ordú
arb_es2_compatibility-drawbuffers: no se encontró la orden
arb_es2_compatibility-drawbuffers: no s'ha trobat l'ordre
arb_es2_compatibility-drawbuffers: opdracht niet gevonden
arb_es2_compatibility-drawbuffers: parancs nem található
arb_es2_compatibility-drawbuffers: perintah tidak ditemukan
arb_es2_compatibility-drawbuffers: príkaz nenájdený
arb_es2_compatibility-drawbuffers: příkaz nenalezen
arb_es2_compatibility-drawbuffers: команда не найдена
arb_es2_compatibility-drawbuffers: командата не е открита
arb_es2_compatibility-drawbuffers: 命令找不到
arb_es2_compatibility-drawbuffers: コマンドが見つかりません