depth_texture_mode_and_swizzle: 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/depth_texture_mode_and_swizzle - from package: piglit

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

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