scissor-polygon: 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/scissor-polygon - from package: piglit

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

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