notes on porting/install

doc/porting_install.shtml

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+
+<h1>Porting and Installation Notes</h1>
+
+
+<h2>Mac OSX</h2>
+
+
+<h3>compiles</h3>
+
+<P>The compile environment on the Mac is basically gcc et. al. so all should be
+very straight forward, but.....
+
+<ul>
+  <li><b>Linking and expat</b>
+      <ul>
+	<li><b>Problem</b>we had problems linking with expat for a while because there
+	    seemed to be a rogue
+	    copy of expat in the Mac X11 libraries ! As this was back level it messed up our
+	    code.
+	<li><b>Solution</b>This problem seems to have gone away now (OSX 10.3.9)
+      </ul>
+</ul>
+
+<h3>DDD</h3>
+
+<P>We had problems with ddd and getting it to find the source code correctly.
+
+<P>In the end we had to comment out the following line in ~/ddd/.init:
+
+<P><pre>set pathname-substitutions
+</pre>
+
+<P>this seems to work now.
+
+
+<p>
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