roffpp: 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/roffpp - from package: cook

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