<p></p>
<p><b>@aabadie</b> commented on this pull request.</p>

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/16425#discussion_r624550432">pkg/esp8266_sdk/Makefile</a>:</p>
<pre style='color:#555'>> +
+ifneq ($(CPU),esp8266)
+  $(error This package can only be used with the ESP8266 CPU)
+endif
</pre>
<p>Instead of this, you could add a Makefile.dep file to the package with the following content:</p>
<div class="highlight highlight-source-makefile"><pre><span class="pl-c"><span class="pl-c">#</span> This package can only be used with the ESP8266 CPU</span>
<span class="pl-smi">FEATURES_REQUIRED</span> += arch_esp8266</pre></div>

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