volk-config-info: 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/volk-config-info - from package: libvolk-bin

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

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