arb_seamless_cubemap-initially-disabled: 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-initially-disabled - from package: piglit

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

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