osgwidgetshader: 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 Debian possible default full paths are:

/usr/bin/osgwidgetshader - from package: openscenegraph

You may install the required package with command apt-get install {package}

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