osgoccluder: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/osgoccluder - from package: openscenegraph

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