BUILTIN_OBJS</code>, and add <code>builtin/psuh.o</code> in the same way next to it in
alphabetical order. Once you&#8217;ve done so, move to the top-level directory and
build simply with <code>make</code>. Also add the <code>DEVELOPER=1</code> variable to turn on
some additional warnings:</p>
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<pre>$ echo DEVELOPER=1 &gt;config.mak
$ make</pre>
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<div class="title">Note</div>