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+http://www.xmission.com/~georgeps/compilation_and_makefiles.html
+http://tronche.com/gui/x/xlib/introduction/
+http://developer.gnome.org/doc/API/libgnomeui/gnomecanvas.html
+http://developer.gnome.org/doc/API/2.0/gdk/gdk-GdkRGB.html
+http://developer.gnome.org/doc/API/2.0/gtk/ch01.html
+http://developer.gnome.org/doc/API/2.0/gtk/GtkDrawingArea.html
+http://developer.gnome.org/doc/API/2.0/gdk/gdk-Drawing-Primitives.html
+http://www.gtk.org/tutorial/ch-gettingstarted.html
+
+Para explicar que es lo que haría el gtk_main_loop:
+http://www.parallab.uib.no/SGI_bookshelves/SGI_Developer/books/OpenGL_Porting/sgi_html/ch04.html#id84559
+
+X Toolkit Intrinsics Programming Manual:
+http://www.parallab.uib.no/SGI_bookshelves/SGI_Developer/books/XLib_WinSys/sgi_html/index.html
+
+Xlib Programming Manual:
+http://www.parallab.uib.no/SGI_bookshelves/SGI_Developer/books/XLib_PG/sgi_html/index.html