rpmelfsym: 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/rpmelfsym - from package: rpmdevtools

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

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