arb_es2_compatibility-shadercompiler: 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/arb_es2_compatibility-shadercompiler - from package: piglit

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

Error in other languages:
arb_es2_compatibility-shadercompiler: bevel nie gevind nie
arb_es2_compatibility-shadercompiler: comandă negăsită
arb_es2_compatibility-shadercompiler: comando não encontrado
arb_es2_compatibility-shadercompiler: commande introuvable
arb_es2_compatibility-shadercompiler: command not found
arb_es2_compatibility-shadercompiler: käsku ei ole
arb_es2_compatibility-shadercompiler: không tìm thấy lệnh
arb_es2_compatibility-shadercompiler: komanda nerasta
arb_es2_compatibility-shadercompiler: Kommando nicht gefunden.
arb_es2_compatibility-shadercompiler: kommandot finns inte
arb_es2_compatibility-shadercompiler: komut yok
arb_es2_compatibility-shadercompiler: nie znaleziono polecenia
arb_es2_compatibility-shadercompiler: níor aimsíodh an t-ordú
arb_es2_compatibility-shadercompiler: no se encontró la orden
arb_es2_compatibility-shadercompiler: no s'ha trobat l'ordre
arb_es2_compatibility-shadercompiler: opdracht niet gevonden
arb_es2_compatibility-shadercompiler: parancs nem található
arb_es2_compatibility-shadercompiler: perintah tidak ditemukan
arb_es2_compatibility-shadercompiler: príkaz nenájdený
arb_es2_compatibility-shadercompiler: příkaz nenalezen
arb_es2_compatibility-shadercompiler: команда не найдена
arb_es2_compatibility-shadercompiler: командата не е открита
arb_es2_compatibility-shadercompiler: 命令找不到
arb_es2_compatibility-shadercompiler: コマンドが見つかりません