fsp: 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
/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/fsp - from package: alliance

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