newinclude: command not found

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/newinclude - from package: fastforward
/var/lib/qmail/bin/newinclude - from package: fastforward

You may install the required package with command apt-get install {package}

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