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