Install the main script for the new IDLE here.
diff --git a/setup.py b/setup.py
index 99b6cff..76005a1 100644
--- a/setup.py
+++ b/setup.py
@@ -1134,7 +1134,7 @@
           ext_modules=[Extension('struct', ['structmodule.c'])],
 
           # Scripts to install
-          scripts = ['Tools/scripts/pydoc']
+          scripts = ['Tools/scripts/pydoc', 'Tools/scripts/idle']
         )
 
 # --install-platlib