autoheader2.13: 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/autoheader2.13 - from package: autoconf2.13

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

Error in other languages:
autoheader2.13: bevel nie gevind nie
autoheader2.13: comandă negăsită
autoheader2.13: comando não encontrado
autoheader2.13: commande introuvable
autoheader2.13: command not found
autoheader2.13: käsku ei ole
autoheader2.13: không tìm thấy lệnh
autoheader2.13: komanda nerasta
autoheader2.13: Kommando nicht gefunden.
autoheader2.13: kommandot finns inte
autoheader2.13: komut yok
autoheader2.13: nie znaleziono polecenia
autoheader2.13: níor aimsíodh an t-ordú
autoheader2.13: no se encontró la orden
autoheader2.13: no s'ha trobat l'ordre
autoheader2.13: opdracht niet gevonden
autoheader2.13: parancs nem található
autoheader2.13: perintah tidak ditemukan
autoheader2.13: príkaz nenájdený
autoheader2.13: příkaz nenalezen
autoheader2.13: команда не найдена
autoheader2.13: командата не е открита
autoheader2.13: 命令找不到
autoheader2.13: コマンドが見つかりません