ext_timer_query-time-elapsed: 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/ext_timer_query-time-elapsed - from package: piglit

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

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