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 harķa 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