example request

[trappedinspacetime]

Hi First of all congrats on your nice tutorials. I am new to openGL, I am on Ubuntu 14.04 platform. I am trying to make a simple screencasting tool. I need to make a screen selection rectangle with mouse to pass coordinates to stout. I found xrectsel.c code based on XLIB but it is flickering. I searched for GLUT examples but I could not find a prototype on the net. Would you please provide such an example? Thanks. Kenn