pcapnav-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/pcapnav-config - from package: libpcapnav0-dev

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

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