problem installing HP 10gbit nic

Hello

Now i have installed a "HP Mellanox Connect-2 Single Port 10 Gbit/s" with the "Finisar 10 Gbit/s SFP+ Modul / Transceiver - Short Wave, 850 nm Modul".
Use the driver for Debian 7.6 (OMV is Wheezy = 7.x right?!) and install by using the manual (http://www.mellanox.com/page/products_dyn?product_family=27).

The problem now...

root@backupsklave:/usr/nic/mlnx-en-3.3-1.0.0.0# ./install.sh
Installing mlnx-en for Linux
Starting installation at Mit Sep 21 16:14:16 CEST 2016...
./install.sh: Zeile 770: rpm: Kommando nicht gefunden.
Checking for Linux headers availability...


ERROR: No kernel sources/headers found for 3.2.0-4-amd64 kernel.
Cannot continue...
To install the missing sources/headers run the following command:
yum install kernel-devel
Verifying dependencies...

Installed Kernel is the "Debian GNU/Linux, with Linux 3.2.0-4-amd64".

Whats going wrong?!

Perfect... Kernal 3.16 and the NIC is running.

I try to connect the cards directly between the two servers. And so i try to set a "pointopoint" option. This is'nt possible by the default web-gui, right?!