unable to compile OpenWrt image using wfx-openwrt

[wireless-road]

Hello!
We are developing IMX6ULL based custom hardware with onboard WF200C Wi-Fi IC.
Here is photo just in a case:
https://thumb.cloud.mail.ru/weblink/thumb/xw1/XqzX/hoJtPKEEX/IMG_20200906_224419.jpg
We have working source code base and able to compile image for that SoM.
Now we are trying to add support for WF200C.
Here what I got going throuth steps described in readme:

al@ubuntu-s-1vcpu-2gb-nyc1-01:~/lorawan-imx6ull$ vi feeds.conf.default

Here how feeds.conf.default looks:

al@ubuntu-s-1vcpu-2gb-nyc1-01:~/lorawan-imx6ull$ cat feeds.conf.default
#src-git packages https://git.openwrt.org/feed/packages.git;openwrt-18.06
#src-git luci https://git.openwrt.org/project/luci.git;openwrt-18.06
#src-git routing https://git.openwrt.org/feed/routing.git;openwrt-18.06
#src-git telephony https://git.openwrt.org/feed/telephony.git;openwrt-18.06

src-git packages git://github.com/openwrt/packages.git;openwrt-18.06
src-git luci https://github.com/openwrt/luci.git;openwrt-18.06
src-git routing git://github.com/openwrt-routing/packages.git;openwrt-18.06
src-git telephony https://github.com/openwrt/telephony.git;openwrt-18.06

# WFX feed
src-git wfx https://github.com/riotnetwork/wfx-openwrt/

Then:

al@ubuntu-s-1vcpu-2gb-nyc1-01:~/lorawan-imx6ull$ scripts/feeds update wfx
Updating feed 'wfx' from 'https://github.com/riotnetwork/wfx-openwrt/' ...
Cloning into './feeds/wfx'...
remote: Enumerating objects: 1071, done.
remote: Counting objects: 100% (1071/1071), done.
remote: Compressing objects: 100% (902/902), done.
remote: Total 1071 (delta 260), reused 800 (delta 157), pack-reused 0
Receiving objects: 100% (1071/1071), 3.06 MiB | 12.38 MiB/s, done.
Resolving deltas: 100% (260/260), done.
Create index file './feeds/wfx.index'
Collecting package info: done
Collecting target info: done
al@ubuntu-s-1vcpu-2gb-nyc1-01:~/lorawan-imx6ull$ scripts/feeds install -a -p wfx
Installing all packages from feed wfx.
Installing package 'wf200' from wfx
Installing package 'wfx' from wfx
WARNING: No feed for package 'kmod-nl80211' found
al@ubuntu-s-1vcpu-2gb-nyc1-01:~/lorawan-imx6ull$ make menuconfig
Collecting package info: done
WARNING: Makefile 'package/feeds/wfx/wfx/Makefile' has a dependency on 'kmod-nl80211', which does not exist
configuration written to .config

*** End of the configuration.
*** Execute 'make' to start the build or try 'make help'.

al@ubuntu-s-1vcpu-2gb-nyc1-01:~/lorawan-imx6ull$ make &
[1] 11100
al@ubuntu-s-1vcpu-2gb-nyc1-01:~/lorawan-imx6ull$ WARNING: Makefile 'package/feeds/wfx/wfx/Makefile' has a dependency on 'kmod-nl80211', which does not exist
time: target/linux/prereq#0.10#0.03#0.13
 make[1] world
 make[2] target/compile
 make[3] -C target/linux compile
 make[2] diffconfig
 make[2] package/cleanup
 make[2] package/compile
...
 make[3] -C feeds/wfx/wfx compile
make -r world: build failed. Please re-run make with -j1 V=s to see what's going on
/home/al/lorawan-imx6ull/include/toplevel.mk:216: recipe for target 'world' failed
make: *** [world] Error 1
[1]+  Exit 2                  make

al@ubuntu-s-1vcpu-2gb-nyc1-01:~/lorawan-imx6ull$ make -j1 V=s
WARNING: Makefile 'package/feeds/wfx/wfx/Makefile' has a dependency on 'kmod-nl80211', which does not exist
make[1]: Entering directory '/home/al/lorawan-imx6ull'
....
make[3]: Entering directory '/home/al/lorawan-imx6ull/feeds/wfx/wfx'
rm -rf /home/al/lorawan-imx6ull/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-imx6ull_cortexa7/wfx/.pkgdir/kmod-wfx.installed /home/al/lorawan-imx6ull/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-imx6ull_cortexa7/wfx/.pkgdir/kmod-wfx
mkdir -p /home/al/lorawan-imx6ull/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-imx6ull_cortexa7/wfx/.pkgdir/kmod-wfx
ERROR: module '/home/al/lorawan-imx6ull/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-imx6ull_cortexa7/wfx/wfx.ko' is missing.
Makefile:71: recipe for target '/home/al/lorawan-imx6ull/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-imx6ull_cortexa7/wfx/.pkgdir/kmod-wfx.installed' failed
make[3]: *** [/home/al/lorawan-imx6ull/build_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/linux-imx6ull_cortexa7/wfx/.pkgdir/kmod-wfx.installed] Error 1
make[3]: Leaving directory '/home/al/lorawan-imx6ull/feeds/wfx/wfx'
Command exited with non-zero status 2
time: package/feeds/wfx/wfx/compile#0.17#0.07#0.25
package/Makefile:107: recipe for target 'package/feeds/wfx/wfx/compile' failed
make[2]: *** [package/feeds/wfx/wfx/compile] Error 2
make[2]: Leaving directory '/home/al/lorawan-imx6ull'
package/Makefile:103: recipe for target '/home/al/lorawan-imx6ull/staging_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/stamp/.package_compile' failed
make[1]: *** [/home/al/lorawan-imx6ull/staging_dir/target-arm_cortex-a7+neon-vfpv4_musl_eabi/stamp/.package_compile] Error 2
make[1]: Leaving directory '/home/al/lorawan-imx6ull'
/home/al/lorawan-imx6ull/include/toplevel.mk:216: recipe for target 'world' failed
make: *** [world] Error 2

Did I do something wrong? Please let me know if any additional information required.