autoheader268: 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/autoheader268 - from package: autoconf268

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

Error in other languages:
autoheader268: bevel nie gevind nie
autoheader268: comandă negăsită
autoheader268: comando não encontrado
autoheader268: commande introuvable
autoheader268: command not found
autoheader268: käsku ei ole
autoheader268: không tìm thấy lệnh
autoheader268: komanda nerasta
autoheader268: Kommando nicht gefunden.
autoheader268: kommandot finns inte
autoheader268: komut yok
autoheader268: nie znaleziono polecenia
autoheader268: níor aimsíodh an t-ordú
autoheader268: no se encontró la orden
autoheader268: no s'ha trobat l'ordre
autoheader268: opdracht niet gevonden
autoheader268: parancs nem található
autoheader268: perintah tidak ditemukan
autoheader268: príkaz nenájdený
autoheader268: příkaz nenalezen
autoheader268: команда не найдена
autoheader268: командата не е открита
autoheader268: 命令找不到
autoheader268: コマンドが見つかりません