g++ main.cpp -o main canvas.cpp circle.cpp rectangle.cpp polygon.cpp sprite.cpp text.cpp line.cpp turtle.cpp turtleSim.cpp -lGL -lGLEW -lglfw -lSOIL


to install glc 
sudo apt-get install libglc-dev





Tips:

1. first complete whole implemetation without using -std=c++11
2. then insert -std=c++11 to configure file
3. include sim.h and sim.cpp and change makefile accordingly
4. reconfigure

