ac++: 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/ac++ - from package: aspectc++

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

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