I have downloaded the tar.gz package from the site and then I have extracted using tar -zxvf command as mentioned over there. After that I used sudo apt-get install build-essential then I further installed libssl-dev. Then I changed directory to the aircrack folder. But when I type either sudo make or just make I am getting this same error. I don't know what to do. I have installed the file what they have asked in the error as well. Still the same error is shown. Okay I am not permitted to upload images. The error is : common.mak:85: *** Cannot find development files for any supported version of libnl. install either libnl1 or libnl3.. Stop.