clip-flag-behavior: 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/clip-flag-behavior - from package: piglit

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

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