vflpp: 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/vflpp - from package: vflib3-bin

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