Setup CImg in ubuntu 14.04

gistfile1.sh

$ sudo apt-get install libx11-dev
$ sudo apt-get install cimg-dev cimg-doc cimg-examples
$ cat >lena.cpp <<EOL
#include "CImg.h"
using namespace cimg_library;

int main() {
	CImg<unsigned char> image("lena.jpg"), visu(500,400,1,3,0);
	const unsigned char red[] = { 255,0,0 }, green[] = { 0,255,0 }, blue[] = { 0,0,255 };
	image.blur(2.5);
	CImgDisplay main_disp(image,"Click a point"), draw_disp(visu,"Intensity profile");
	while (!main_disp.is_closed() && !draw_disp.is_closed()) {
		main_disp.wait();
		if (main_disp.button() && main_disp.mouse_y()>=0) {
			const int y = main_disp.mouse_y();
			visu.fill(0).draw_graph(image.get_crop(0,y,0,0,image.width()-1,y,0,0),red,1,1,0,255,0);
			visu.draw_graph(image.get_crop(0,y,0,1,image.width()-1,y,0,1),green,1,1,0,255,0);
			visu.draw_graph(image.get_crop(0,y,0,2,image.width()-1,y,0,2),blue,1,1,0,255,0).display(draw_disp);
		}
	}
	return 0;
}
EOL
$ g++ -Wall -o lena lena.cpp -lpthread -lX11
$ ./lena