The package osg can be configured to use different OpenGL profiles via a custom triplet file.
Possible values are GLCORE, GL2, GL3, GLES1, GLES2, GLES3 and GLES2+GLES3.
The default value is GL2. If you want use other profiles, please add the following 
code to a custom triplet file.
set(osg_OPENGL_PROFILE GL3)
