osgearth在Mac OSX上高程加载失败

freeblow

#include <osg/Notify>
#include <osgGA/GUIEventHandler>
#include <osgGA/StateSetManipulator>
#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>
#include <osgEarth/MapNode>
#include <osgEarthUtil/EarthManipulator>
#include <osgEarthUtil/AutoClipPlaneHandler>
#include <osgEarthUtil/Controls>
#include <osgEarthSymbology/Color>
#include <osgEarthDrivers/tms/TMSOptions>

using namespace osgEarth;
using namespace osgEarth:rivers;
using namespace osgEarth::Util;

/**
* How to create a simple osgEarth map and display it.
*/
int
main(int argc, char** argv)
{
    osg::ArgumentParser arguments(&argc,argv);
   
    osg::setNotifyLevel(osg::INFO);

    // create the map.
    Map* map = new Map();

    // add a TMS imager layer:
    TMSOptions imagery;
    imagery.url() = "http://readymap.org/readymap/tiles/1.0.0/7/";
    map->addImageLayer( new ImageLayer("Imagery", imagery) );

    // add a TMS elevation layer:
    TMSOptions elevation;
    elevation.url() = "http://readymap.org/readymap/tiles/1.0.0/9/";
   
    map->addElevationLayer( new ElevationLayer("Elevation", elevation) );
   

    // make the map scene graph:
    MapNode* node = new MapNode( map );

    // initialize a viewer:
    osgViewer::Viewer viewer(arguments);
    viewer.setCameraManipulator( new EarthManipulator );
    viewer.setSceneData( node );

    // add some stock OSG handlers:
    viewer.addEventHandler(new osgViewer::StatsHandler());
    viewer.addEventHandler(new osgViewer::WindowSizeHandler());
    viewer.addEventHandler(new osgViewer::ThreadingHandler());
    viewer.addEventHandler(new osgViewer:ODScaleHandler());
    viewer.addEventHandler(new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()));
    viewer.addEventHandler(new osgViewer::HelpHandler(arguments.getApplicationUsage()));
   
    viewer.setUpViewInWindow(100, 100, 640, 480);

    return viewer.run();
}


其实就是，application_osgearth_map 这个demo。日志看了，看不出来～
请各位大神，帮忙看看～