gnatname: 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/gnatname - from package: gcc-gnat

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

On Debian possible default full paths are:

/usr/bin/gnatname - from package: gnat-4.9

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

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