<p>Just small hints that can do it:</p>
<ul>
<li>try to add <code>CC_EXTRA_OPTS="-DMY_CUSTOM_FLAG"</code> to <code>make cfg ...</code> command.</li>
<li>changing <code>Makefile.defs</code> after <code>make cfg ...</code> makes the <code>make Q=0</code> run internally another simple <code>make cfg</code></li>
</ul>
<p>As Henning said, in case of still having issue, open an issue for a maintained branch to try to get some more help.</p>

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