vao-element-array-buffer: 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/vao-element-array-buffer - from package: piglit

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

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