glsl-routing: 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/glsl-routing - from package: piglit

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

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