Problem installing a 6LoWPAN enabled Linux kernel for nRF51 IoT SDK

[Max]

I followed the instructions in developer.nordicsemi.com/.../a00058.html and reached Obtaining the kernel: Option 2: Native build. I failed at step 3 and the error message goes like this:

pi@raspberrypi ~/raspbian/linux $ make –j5 && make –j5 modules

scripts/kconfig/conf --silentoldconfig Kconfig

make: *** No rule to make target '–j5'. Stop.

I also tries the next step (step 4) but failed too as below: pi@raspberrypi ~/raspbian/linux $ CONCURRENCY_LEVEL=5 DEB_HOST_ARCH=armhf fakeroot make-kpkg --append-to-version –name_of_your_choice --revision date +%Y%m%d%H%M%S --initrd kernel_image kernel_headers

Error: The extended version may only contain lowercase alphanumerics and the characters - + .

The current value is: –name_of_your_choice

Aborting.

Please help.

[Max]

I create a tunnel and add an entry to /etc/network/interfaces as follows:

auto lo

iface lo inet loopback

iface eth0 inet dhcp

allow-hotplug wlan0

iface wlan0 inet manual

wpa-roam /etc/wpa_supplicant/wpa_supplicant.conf

iface default inet dhcp

iface eth0 inet6 dhcp

auto he-ipv6

iface he-ipv6 inet6 v4tunnel

    address 2001:470:18:f4e::2

    netmask 64

    endpoint 216.218.221.6

    local 122.116.221.151

    ttl 255

    gateway 2001:470:18:f4e::1

up ip addr add 2001:xxxx:xxxx:aaaa::1/64 dev eth0 #assign your IPv6 address

down ip addr add 2001:xxxx:xxxx:aaaa::1/64 dev eth0 #assign your IPv6 address

But still fail the IPv6 test.