ext_packed_depth_stencil-readpixels-24_8: 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_depth_stencil-readpixels-24_8 - from package: piglit

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

Error in other languages:
ext_packed_depth_stencil-readpixels-24_8: bevel nie gevind nie
ext_packed_depth_stencil-readpixels-24_8: comandă negăsită
ext_packed_depth_stencil-readpixels-24_8: comando não encontrado
ext_packed_depth_stencil-readpixels-24_8: commande introuvable
ext_packed_depth_stencil-readpixels-24_8: command not found
ext_packed_depth_stencil-readpixels-24_8: käsku ei ole
ext_packed_depth_stencil-readpixels-24_8: không tìm thấy lệnh
ext_packed_depth_stencil-readpixels-24_8: komanda nerasta
ext_packed_depth_stencil-readpixels-24_8: Kommando nicht gefunden.
ext_packed_depth_stencil-readpixels-24_8: kommandot finns inte
ext_packed_depth_stencil-readpixels-24_8: komut yok
ext_packed_depth_stencil-readpixels-24_8: nie znaleziono polecenia
ext_packed_depth_stencil-readpixels-24_8: níor aimsíodh an t-ordú
ext_packed_depth_stencil-readpixels-24_8: no se encontró la orden
ext_packed_depth_stencil-readpixels-24_8: no s'ha trobat l'ordre
ext_packed_depth_stencil-readpixels-24_8: opdracht niet gevonden
ext_packed_depth_stencil-readpixels-24_8: parancs nem található
ext_packed_depth_stencil-readpixels-24_8: perintah tidak ditemukan
ext_packed_depth_stencil-readpixels-24_8: príkaz nenájdený
ext_packed_depth_stencil-readpixels-24_8: příkaz nenalezen
ext_packed_depth_stencil-readpixels-24_8: команда не найдена
ext_packed_depth_stencil-readpixels-24_8: командата не е открита
ext_packed_depth_stencil-readpixels-24_8: 命令找不到
ext_packed_depth_stencil-readpixels-24_8: コマンドが見つかりません