arb_fragment_program-sparse-samplers: 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_fragment_program-sparse-samplers - from package: piglit

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

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