arb_transform_feedback2-gen-names-only: 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_transform_feedback2-gen-names-only - from package: piglit

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

Error in other languages:
arb_transform_feedback2-gen-names-only: bevel nie gevind nie
arb_transform_feedback2-gen-names-only: comandă negăsită
arb_transform_feedback2-gen-names-only: comando não encontrado
arb_transform_feedback2-gen-names-only: commande introuvable
arb_transform_feedback2-gen-names-only: command not found
arb_transform_feedback2-gen-names-only: käsku ei ole
arb_transform_feedback2-gen-names-only: không tìm thấy lệnh
arb_transform_feedback2-gen-names-only: komanda nerasta
arb_transform_feedback2-gen-names-only: Kommando nicht gefunden.
arb_transform_feedback2-gen-names-only: kommandot finns inte
arb_transform_feedback2-gen-names-only: komut yok
arb_transform_feedback2-gen-names-only: nie znaleziono polecenia
arb_transform_feedback2-gen-names-only: níor aimsíodh an t-ordú
arb_transform_feedback2-gen-names-only: no se encontró la orden
arb_transform_feedback2-gen-names-only: no s'ha trobat l'ordre
arb_transform_feedback2-gen-names-only: opdracht niet gevonden
arb_transform_feedback2-gen-names-only: parancs nem található
arb_transform_feedback2-gen-names-only: perintah tidak ditemukan
arb_transform_feedback2-gen-names-only: príkaz nenájdený
arb_transform_feedback2-gen-names-only: příkaz nenalezen
arb_transform_feedback2-gen-names-only: команда не найдена
arb_transform_feedback2-gen-names-only: командата не е открита
arb_transform_feedback2-gen-names-only: 命令找不到
arb_transform_feedback2-gen-names-only: コマンドが見つかりません