eu-ar: command not found

Have You tried accessing the binary with the full path?

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/eu-ar - from package: elfutils

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

On Debian possible default full paths are:

/usr/bin/eu-ar - from package: elfutils

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