autoreconf268: 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/autoreconf268 - from package: autoconf268

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

Error in other languages:
autoreconf268: bevel nie gevind nie
autoreconf268: comandă negăsită
autoreconf268: comando não encontrado
autoreconf268: commande introuvable
autoreconf268: command not found
autoreconf268: käsku ei ole
autoreconf268: không tìm thấy lệnh
autoreconf268: komanda nerasta
autoreconf268: Kommando nicht gefunden.
autoreconf268: kommandot finns inte
autoreconf268: komut yok
autoreconf268: nie znaleziono polecenia
autoreconf268: níor aimsíodh an t-ordú
autoreconf268: no se encontró la orden
autoreconf268: no s'ha trobat l'ordre
autoreconf268: opdracht niet gevonden
autoreconf268: parancs nem található
autoreconf268: perintah tidak ditemukan
autoreconf268: príkaz nenájdený
autoreconf268: příkaz nenalezen
autoreconf268: команда не найдена
autoreconf268: командата не е открита
autoreconf268: 命令找不到
autoreconf268: コマンドが見つかりません