nxcl: command not found

Have You tried accessing the binary with the full path?

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/nxcl - from package: libnxcl-bin

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