arb_vertex_array-isvertexarray: 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_vertex_array-isvertexarray - from package: piglit

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

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