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I just found https://www.opengl.org/discussion_boards/showthread.php/157014-Compiling-with-gcc, and I modified the code to get rid of the 100% CPU hog; it seems to work fine on Ubuntu 14.04 - simply run it from a terminal, draw your rectangle area, and the program will exit, printing the coordinates in the terminal: xrectsel.c: #include<stdio.h> ...



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