Be more specific about building the module

Author: nmaier

docs/Readme.html

@@ -101,8 +101,16 @@ <h3>Benefits</h3>
       <h2>Installation</h2>
       <ol>
         <li>Grab the source.</li>
-        <li>Compile and install<br />
-          <code>apxs -cia mod_xsendfile.c</code></li>
+        <li>Compile and install
+          <ul>
+            <li>In general:<br/>
+            <code>apxs -cia mod_xsendfile.c</code></li>
+            <li>Debian/Ubuntu uses apxs2:<br/>
+            <code>apxs2 -cia mod_xsendfile.c</code></li>
+            <li>Mac users might want to build fat binaries:<br/>
+            <code>apxs -cia -Wc,"-arch i386 -arch x86_64" -Wl,"-arch i386 -arch x86_64" mod_xsendfile.c</code></li>
+          </ul>
+        </li>
         <li>Restart apache</li>
         <li>That's all.</li>
       </ol>