LiME: Nexus 5 - Compile error

I'm trying to make a forensic image of the volatile memory (RAM) of the LG Nexus 5 with LiME.
I followed the instructions (1.4) but when i try to locate /proc/config.gz on the device (via ADB), the file does not exists.

Edit Problem above is solved. (Used the .defconfig from the hammerhead kernel).

New problem When trying to execute 'make ARCH=arm CROSS_COMPILE=$CC_PATH/arm-eabi- modules_prepare', error raised 'make *** No rule to make target ‘modules_prepare’. Stop’.

Maybe someone got a solution to this or know other methods to acquire an image of the RAM?

Thanks in advance.