vbo-buffer-unmap: 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/vbo-buffer-unmap - from package: piglit

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

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