gl-2.0-edgeflag-immediate: 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/gl-2.0-edgeflag-immediate - from package: piglit

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

Error in other languages:
gl-2.0-edgeflag-immediate: bevel nie gevind nie
gl-2.0-edgeflag-immediate: comandă negăsită
gl-2.0-edgeflag-immediate: comando não encontrado
gl-2.0-edgeflag-immediate: commande introuvable
gl-2.0-edgeflag-immediate: command not found
gl-2.0-edgeflag-immediate: käsku ei ole
gl-2.0-edgeflag-immediate: không tìm thấy lệnh
gl-2.0-edgeflag-immediate: komanda nerasta
gl-2.0-edgeflag-immediate: Kommando nicht gefunden.
gl-2.0-edgeflag-immediate: kommandot finns inte
gl-2.0-edgeflag-immediate: komut yok
gl-2.0-edgeflag-immediate: nie znaleziono polecenia
gl-2.0-edgeflag-immediate: níor aimsíodh an t-ordú
gl-2.0-edgeflag-immediate: no se encontró la orden
gl-2.0-edgeflag-immediate: no s'ha trobat l'ordre
gl-2.0-edgeflag-immediate: opdracht niet gevonden
gl-2.0-edgeflag-immediate: parancs nem található
gl-2.0-edgeflag-immediate: perintah tidak ditemukan
gl-2.0-edgeflag-immediate: príkaz nenájdený
gl-2.0-edgeflag-immediate: příkaz nenalezen
gl-2.0-edgeflag-immediate: команда не найдена
gl-2.0-edgeflag-immediate: командата не е открита
gl-2.0-edgeflag-immediate: 命令找不到
gl-2.0-edgeflag-immediate: コマンドが見つかりません