Update readme with wxwidgets instructions

Author: jonfink

README.md

@@ -10,6 +10,15 @@ For now, follow [https://code.ros.org/svn/ros-pkg/stacks/visualization/trunk/rvi
 
 For Ogre, I just download and use the precompiled SDK from their [website](http://www.ogre3d.org/) (currently using 1.7.3).
 
+### wxWidgets-2.9.2
+
+I skipped macports for this one and configured with
+     $ ./configure --with-libjpeg --with-libtiff -with-libpng --with-zlip --with-opengl --with-cocoa --without-sdl --enable-unicode --enable-display --with-macosx-sdk=/Developer/SDKs/MacOSX10.6.sdk --with-macosx-version-min=10.6 --enable-debug --prefix=/opt/local --without-carbon --with-osx_cocoa --with-sdl
+     $ make
+     $ sudo make install
+
+I cannot, for the life of me, figure out why this works while the version with macports does not (even after altering the Portfile to use the same compiler version, architecture, optimization flags).  For me, using the macports version of wxWidgets-2.9.2 leads to an error on _wxGUIEventLoop::BeginModalSession ()_ which occurs after the _wxSafeYield()_ call in _splash\_screen.cpp_... My plan for now is to do this source compile of wxWidgets and trick macports into thinking it's version is installed -- nice and hacky...
+
 ## Build instructions
 
 ...