compiler error, 2016.2, RHEL-6.8

[logan_number5]

HI, I've done some extensive searching but can't find anyone
else every having this problem:

Looks like the file 'fstream' is coming from osgDB and not the system,
and is making the build unhappy (cmake). Any ideas?
(I tried to make it more readable here)

cd /home/mlogan/fgsrc/build-fg/utils/fgelev &&
/usr/bin/c++
-DHAVE_CONFIG_H
-DWITH_EVENTINPUT
-Wall
-D_REENTRANT
-DBOOST_BIMAP_DISABLE_SERIALIZATION
-O3
-DNDEBUG
-I/home/mlogan/fgsrc/flightgear.git/3rdparty/iaxclient/lib
-I/usr/include/dbus-1.0
-I/usr/lib64/dbus-1.0/include
-I/usr/local/aces/OpenSceneGraph-3.5.3/include/osgText
-I/usr/local/aces/OpenSceneGraph-3.5.3/include/osgSim
-I/usr/local/aces/OpenSceneGraph-3.5.3/include/osgDB
-I/usr/local/aces/OpenSceneGraph-3.5.3/include/osgParticle
-I/usr/local/aces/OpenSceneGraph-3.5.3/include/osgFX
-I/usr/local/aces/OpenSceneGraph-3.5.3/include/osgUtil
-I/usr/local/aces/OpenSceneGraph-3.5.3/include/osgViewer
-I/usr/local/aces/OpenSceneGraph-3.5.3/include/osgGA
-I/usr/local/aces/OpenSceneGraph-3.5.3/include
-I/usr/local/aces/OpenSceneGraph-3.5.3/include/OpenThreads
-I/usr/local/include
-I/usr/include/AL
-I/home/mlogan/FG-2016.2/include
-I/home/mlogan/FG-2016.2/include/simgear/3rdparty/utf8
-I/home/mlogan/plib-1.8.5/include
-I/home/mlogan/fgsrc/flightgear.git/3rdparty/sqlite3
-I/home/mlogan/fgsrc/flightgear.git
-I/home/mlogan/fgsrc/flightgear.git/src
-I/home/mlogan/fgsrc/build-fg/src
-I/home/mlogan/fgsrc/build-fg/src/Include
-I/home/mlogan/fgsrc/flightgear.git/3rdparty/hts_engine_API/include
-I/home/mlogan/fgsrc/flightgear.git/3rdparty/flite_hts_engine/include
-o CMakeFiles/fgelev.dir/fgelev.cxx.o -c /home/mlogan/fgsrc/flightgear.git/utils/fgelev/fgelev.cxx
In file included from /usr/local/aces/OpenSceneGraph-3.5.3/include/osgDB/Output:20,
from /usr/local/aces/OpenSceneGraph-3.5.3/include/osgDB/DotOsgWrapper:21,
from /usr/local/aces/OpenSceneGraph-3.5.3/include/osgDB/Registry:26,
from /usr/local/aces/OpenSceneGraph-3.5.3/include/osgDB/FileUtils:17,
from /home/mlogan/FG-2016.2/include/simgear/scene/model/ModelRegistry.hxx:24,
from /home/mlogan/fgsrc/flightgear.git/utils/fgelev/fgelev.cxx:40:
/usr/local/aces/OpenSceneGraph-3.5.3/include/osgDB/fstream:35: error: invalid use of incomplete type ‘struct std::ifstream’
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iosfwd:81: error: declaration of ‘struct std::ifstream’
/usr/local/aces/OpenSceneGraph-3.5.3/include/osgDB/fstream:47: error: invalid use of incomplete type ‘struct std::ofstream’
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/iosfwd:84: error: declaration of ‘struct std::ofstream’
make[2]: *** [utils/fgelev/CMakeFiles/fgelev.dir/fgelev.cxx.o] Error 1
make[2]: Leaving directory `/home/mlogan/fgsrc/build-fg'
make[1]: *** [utils/fgelev/CMakeFiles/fgelev.dir/all] Error 2
make[1]: Leaving directory `/home/mlogan/fgsrc/build-fg'
make: *** [all] Error 2


thanks for any help.

[logan_number5]

Answered my own question.

The cmake config shouldn't specify every include dir for osg, just one path.
The same for all of them.

sorry for the spam.