+
+ The hacks themselves use utils/grabclient.c to invoke the
+ "xscreensaver-getimage" program as a sub-process.
+
+ This code is linked only into "driver/xscreensaver-getimage". On normal
+ X11 systems, "xscreensaver-getimage.c" invokes the code in this file.
+
+ However, under X11 on MacOS, "xscreensaver-getimage" instead runs the
+ script "driver/xscreensaver-getimage-desktop", which invokes the MacOS-
+ specific program "/usr/sbin/screencapture" to get the desktop image.
+
+ However again, for the MacOS-native (Cocoa) build of the screen savers,
+ "utils/grabclient.c" instead links against "OSX/osxgrabscreen.m", which
+ grabs screen images directly without invoking a sub-process to do it.