I recently installed ROOT ver. 5.20 into ubuntu.
Install went well, and I was able to perform basic task
such as read .root file with TFile, pop an canvas with TCanvas etc.
When I tried to use TGLViewer3D, TGLScene etc, root
complains that TGLViewer3D is not defined, and there is no
such file as TGLViewer3D.h
Do I need to do something special at installation stage to
install TGL classes ?
Apparently your root was compiled without OpenGL support.
This probably means that you need the packages that provide the GL header files and/or shared libraries (you need libGL and libGLU).
If you do
and ‘opengl’ is not listed, that’s it.
When running ‘configure’ pay attention for what checks are being performed related to GL.
Yes, I re-run ./configure, and I totally missed
Hopefully this will fix the problem.