diff --git a/doc/build.html b/doc/build.html
index 5065820..c074332 100644
--- a/doc/build.html
+++ b/doc/build.html
@@ -108,7 +108,7 @@ width="88" height="32" border="0" alt="Support This Project"></a></td></tr> -->
 
 <p>For platforms other than MS Windows, the provided <tt>Makefile</tt> is used.</p> 
 
-<p>Command-line variables:</p>
+<h4>Command-line variables</h4>
 
 <table border=0 cellpadding=0 cellspacing=10>
 <tr><td valign=top><tt>SYSTEM</tt></td><td valign=top>auto</td>
@@ -118,7 +118,7 @@ width="88" height="32" border="0" alt="Support This Project"></a></td></tr> -->
 <td align=left>Base directory for installation.</td></tr>
 </table>
 
-<p>Make targets:</p>
+<h4>Make targets</h4>
 
 <table border=0 cellpadding=0 cellspacing=10>
 <tr><td valign=top><tt>all</tt></td><td>Build everything.</td><tr>
@@ -132,6 +132,18 @@ width="88" height="32" border="0" alt="Support This Project"></a></td></tr> -->
 <tr><td valign=top><tt>install.bin</tt></td><td>Install <tt>glewinfo</tt> and <tt>visualinfo</tt> utilities.</td><tr>
 <tr><td valign=top><tt>uninstall</tt></td><td>Delete installed files.</td><tr>
 </table>
+
+<h4>Requirements</h4>
+
+<ul>
+<li>GNU make</li>
+<li>perl</li>
+<li>wget</li>
+<li>GNU sed</li>
+<li>gcc compiler</li>
+</ul>
+
+Ubuntu: <pre>sudo apt-get install Xmu-dev Xi-Dev</pre>
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