glsl-derivs: 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-derivs - from package: piglit

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

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