npth-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/npth-config - from package: libnpth0-dev

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

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