framebuffer-blit-levels: 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/framebuffer-blit-levels - from package: piglit

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

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