Cross compile cqueues

I need async networking for a project I am currently working on and would like to cross compile cqueues for my Netgear WNDR 3700 v4 on my desktop machine. I started a docker container running Alpine and followed the install instructions.

I also followed the build system usage guide until make menuconfig and selected the Atheros AR9XXX target.

However since I never before did any cross compilation I am stuck at the second step in the cross compilation guide. There are no directories inside staging_dir other than host.

What am I missing here?
Thanks in advance for any help.