proxy-texture: 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/proxy-texture - from package: piglit

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

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