invalid use of incomplete type ‘std::ifstream in readNodeFile

[kyungsoo hong]

Hi,

I confirmed Findosg.cmake and others under /usr/share/cmake-3.5/Modules
and I also input OSG_DIR in .bashrc like 
export OSG_DIR=/home/kyungsoo/Graphics/OpenSceneGraph

but still cmake can not find any of osg package 

even I tried install ccmake and build it again 
since this time I set on  for BUILD_OSG_EXAMPLES and BUILD_OSG_PACKAGES
it is required freetype missing, gtk missing etc etc 
and i fixed all installing library accordingly
but still it can not find package.  
... 

Thank you!

Cheers,
kyungsoo :'

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http://forum.openscenegraph.org/viewtopic.php?p=68609#68609