ext_packed_float-pack: 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/ext_packed_float-pack - from package: piglit

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

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