varying-packing-simple: 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/varying-packing-simple - from package: piglit

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

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