2 lines from Makefile
runmaze : runmaze.o MazeRunner.o
RandomMazeRunner.o Maze.o
SquareMaze.o
VisualizeSquareMazeRunner.o
GPKernel.o
   g++ -o runmaze -g runmaze.o
MazeRunner.o RandomMazeRunner.o
Maze.o SquareMaze.o
VisualizeSquareMazeRunner.o
GPKernel.o -L/usr/X11R6/lib -lX11