lodclamp: 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/lodclamp - from package: piglit

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

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