dh_autoreconf: 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/dh_autoreconf - from package: dh-autoreconf

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

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