arb_blend_func_extended-fbo-extended-blend: 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_blend_func_extended-fbo-extended-blend - from package: piglit

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

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