arb_seamless_cubemap: 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_seamless_cubemap - from package: piglit

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

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