m4: 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/m4 - from package: m4

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

On Debian possible default full paths are:

/usr/bin/m4 - from package: m4

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

Error in other languages:
m4: bevel nie gevind nie
m4: comandă negăsită
m4: comando não encontrado
m4: commande introuvable
m4: command not found
m4: käsku ei ole
m4: không tìm thấy lệnh
m4: komanda nerasta
m4: Kommando nicht gefunden.
m4: kommandot finns inte
m4: komut yok
m4: nie znaleziono polecenia
m4: níor aimsíodh an t-ordú
m4: no se encontró la orden
m4: no s'ha trobat l'ordre
m4: opdracht niet gevonden
m4: parancs nem található
m4: perintah tidak ditemukan
m4: príkaz nenájdený
m4: příkaz nenalezen
m4: команда не найдена
m4: командата не е открита
m4: 命令找不到
m4: コマンドが見つかりません