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.

[Øyvind Karlsen]

Are you using Raspberry Pi 2? If so, please use this tutorial.

[Max]

Yes, I am using RPi 2. The link you sent is exactly the one I am referring to but fail when executing "make -j5 && make -j5 modules".

[Øyvind Karlsen]

Ok, so in step 2 you use make bcm2709_defconfig?

[Max]

Yes and it succeeds to write configuration to .config.

[Øyvind Karlsen]

This module is also added to the latest raspberry pi kernel, so you could just do apt-get update&&apt-get dist-upgrade