I tried building with gcc 4.3 from macports and i got some errors like:

Code:
In file included from 
/System/Library/Frameworks/AppKit.framework/Headers/NSColor.h:35,
                 from 
/System/Library/Frameworks/AppKit.framework/Headers/AppKit.h:37,
                 from 
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:13,
                 from 
/Users/manueru/Desarrollo/OpenSceneGraph/OpenSceneGraph-3.0.1/src/osgViewer/GraphicsWindowCocoa.mm:18:
/System/Library/Frameworks/AppKit.framework/Headers/NSPasteboard.h:193: error: 
expected constructor, destructor, or type conversion before '-' token
/System/Library/Frameworks/AppKit.framework/Headers/NSPasteboard.h:199: error: 
expected constructor, destructor, or type conversion before '-' token
/System/Library/Frameworks/AppKit.framework/Headers/NSPasteboard.h:205: error: 
expected constructor, destructor, or type conversion before '-' token
/System/Library/Frameworks/AppKit.framework/Headers/NSPasteboard.h:233: error: 
expected constructor, destructor, or type conversion before '+' token
/System/Library/Frameworks/AppKit.framework/Headers/NSPasteboard.h:239: error: 
expected constructor, destructor, or type conversion before '+' token
/System/Library/Frameworks/AppKit.framework/Headers/NSPasteboard.h:245: error: 
expected constructor, destructor, or type conversion before '-' token
In file included from 
/System/Library/Frameworks/QuartzCore.framework/Headers/../Frameworks/CoreImage.framework/Headers/CIColor.h:6,
                 from 
/System/Library/Frameworks/QuartzCore.framework/Headers/CIColor.h:1,
                 from 
/System/Library/Frameworks/AppKit.framework/Headers/NSColor.h:36,
                 from 
/System/Library/Frameworks/AppKit.framework/Headers/AppKit.h:37,
                 from 
/System/Library/Frameworks/Cocoa.framework/Headers/Cocoa.h:13,
                 from 
/Users/manueru/Desarrollo/OpenSceneGraph/OpenSceneGraph-3.0.1/src/os




Keywords @required and @optional are part of Objective C 2.0. So you should try 
with at least gcc 4.6. Hope it helps.

Cheers,
Manuel

------------------------
See you, Manuel.

------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=48879#48879





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