-NOTE: by default, the GTK package is configured to be installed in
-/usr/local/gtk-win32, if you want to change this path, then you need to edit
-the gtk-win32/bin/gtk-config file and change "gtk_dir=" accordingly.
-The same is true for the SDL package, it is installed in
-/usr/local/SDL-1.2.3-win32 by default and you need to change "prefix=" in
-SDL-1.2.3-win32/i386-mingw32msvc/bin/sdl-config if you plan to extract the
-archive in a different directory.