<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/3915#discussion_r40178478">boards/z1/Makefile.dep</a>:</p>
<pre style='color:#555'>> @@ -0,0 +1,5 @@
> +ifneq (,$(filter gnrc_netif_default,$(USEMODULE)))
> +  USEMODULE += xtimer
</pre>
<p>move to Makefile.dep</p>

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