hardened-c++: 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/hardened-c++ - from package: hardening-wrapper

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

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