autoheader: 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 CentOS possible default full paths are:

/usr/bin/autoheader - from package: autoconf

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/autoheader - from package: autoconf2.13
/usr/bin/autoheader - from package: autoconf

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

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