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

<hr>

<p>In <a href="https://github.com/RIOT-OS/RIOT/pull/11672#discussion_r293367944">dist/tools/buildsystem_sanity_check/check.sh</a>:</p>
<pre style='color:#555'>> @@ -69,7 +74,8 @@ check_not_exporting_variables() {
         patterns+=(-e "export[[:blank:]]\+${variable}")
     done
 
-    git -C "${RIOTBASE}" grep "${patterns[@]}"
+    git -C "${RIOTBASE}" grep "${patterns[@]}" \
+        | sed '1i \\nVariables must not be exported:'
</pre>
<p>I will try it on mac too.</p>

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