occlusion_query_meta_no_fragments: 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/occlusion_query_meta_no_fragments - from package: piglit

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

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