fp-fog: 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/fp-fog - from package: piglit

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

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