godef: 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 Debian possible default full paths are:

/usr/bin/godef - from package: emboss

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

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