rtaudio-config: 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/rtaudio-config - from package: librtaudio-dev

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

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