osgthreadedterrain: 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/osgthreadedterrain - from package: openscenegraph

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