glx-fbconfig-compliance: 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/glx-fbconfig-compliance - from package: piglit

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

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