I just built OpendTect 6.0 from source on my kUbuntu 15.10 system (64 bits). It was so easy ...
svn co https://github.com/opendtect/opendtect.git/branches/od6.0 ./od6.0Installed openscenegraph (already had cmake) from the package manager (turns out to be 3.2.1), then:
cd od6.0; cmake-gui .Set QTDIR to /usr/lib/x86_64-linux-gnu/qt4 (just leave OSG_DIR empty). Configure, Generate. Now make. Got 8 processors with 16 threads, so let's rock:
make -j126 minutes later: Done.
cd bin/lux64/Debug; ./od_main
If all you want is to use the free OD base then this may be faster than using the installation manager :)