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<tt>I skipped ahead to Chapter 6 in HtDP but that chapter did not
specify which teachpack contained (make-posn). Loading the draw
teachpack worked for </tt><code class="scheme"><br>
<br>
<br>
(<span class="variable">start</span> <span class="selfeval">300</span>
<span class="selfeval">300</span>)</code> ; which opens a canvas;
<p><font face="Arial Black"><code class="scheme"><font
 face="Times New Roman, Times, serif">but failed for:</font><br>
</code></font></p>
<p><code class="scheme">(<span class="variable">draw-solid-line</span> (<span
 class="builtin">make-posn</span> <span class="selfeval">10</span> <span
 class="selfeval">10</span>) (<span class="builtin">make-posn</span> <span
 class="selfeval">110</span> <span class="selfeval">10</span>) <span
 class="keyword">'</span><span class="variable">red)<br>
</span></code></p>
<p><code class="scheme"><span class="variable"><font
 face="Times New Roman, Times, serif">because make-posn was undefined.</font><br>
<br>
</span></code></p>
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