arb_vertex_buffer_object-mixed-immediate-and-vbo: 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/arb_vertex_buffer_object-mixed-immediate-and-vbo - from package: piglit

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

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