Add --check-tkinter to setup.py. Install IDLE. Fixes #634078.
diff --git a/Misc/NEWS b/Misc/NEWS
index d35cc0f..5d97dd7 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -582,6 +582,8 @@
 Build
 -----
 
+- On Unix, IDLE is now installed automatically.
+
 - The fpectl module is not built by default; it's dangerous or useless
   except in the hands of experts.