* Changes to the distribution
-** There is a new thread implementation option: "null".
+** There is a new thread implementation option "null", which is also
+ the default now.
When you configure "--with-threads=null", you will get the usual
threading API (call-with-new-thread, make-mutex, etc), but you can't
threads.
When cooperative threading is not supported on your platform, you will
-get the "null" threads.
+get the "null" threads instead.
The long term plan is to make the selection of a thread implementation
a run-time option, not a configure time option.