Add Maxim's blurb about using gnomedepends.py to determine what packages

your port may need.

en/gnome/docs/porting.sgml

@@ -69,6 +69,21 @@ WANT_GNOME=	yes
 	      Center, but does not use anything from GNOME Core.  This option is 
 	      usually used for backend APIs.</p></li>
           </ul>
+
+          <p>When building GNOME ports, remember that many applications 
+		  require shared directories in <tt>${PREFIX}/share/gnome</tt>.  Ports
+		  should be constructed in a way such that files placed in these 
+		  directories are removed before the package which created the
+		  directories (i.e. the package that has an appropriate 
+		  <tt>@dirrm</tt> in its pkg-plist).  For GNOME, the principle
+		  parent port is <tt>gnomecore</tt>.  If your port incudes
+		  <tt>USE_GNOME= yes</tt> you should be fine.  If you're 
+		  uncertain if you need to require any other packages, you can use
+		  the script <tt>${PORTSDIR}/Tools/scripts/gnomedepends.py</tt> 
+		  to examine your port's pkg-plist.</p>
+
+		  <p>To see a list of what packages your port will actually require,
+		  use the command <tt>make package-depends</tt>.</p>
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