arb_texture_buffer_object-unused-name: 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_texture_buffer_object-unused-name - from package: piglit

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

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