Fix for issue5194, based on a patch by Ned Deily.
diff --git a/Mac/Makefile.in b/Mac/Makefile.in
index f28d1ea..e847ba9 100644
--- a/Mac/Makefile.in
+++ b/Mac/Makefile.in
@@ -215,7 +215,7 @@
install_IDLE:
test -d "$(DESTDIR)$(PYTHONAPPSDIR)" || mkdir -p "$(DESTDIR)$(PYTHONAPPSDIR)"
- -test -d "$(DESTDIR)$(PYTHONAPPSDIR)/IDLE.app" && rm -r "$(DESTDIR)$(PYTHONAPPSDIR)/IDLE.app"
+ -test -d "$(DESTDIR)$(PYTHONAPPSDIR)/IDLE.app" && rm -rf "$(DESTDIR)$(PYTHONAPPSDIR)/IDLE.app"
/bin/cp -PR "$(srcdir)/IDLE/IDLE.app" "$(DESTDIR)$(PYTHONAPPSDIR)"
ln -sf $(INSTALLED_PYTHONAPP) "$(DESTDIR)$(PYTHONAPPSDIR)/IDLE.app/Contents/MacOS/Python"
sed -e "s!%prefix%!$(prefix)!g" -e 's!%exe%!$(PYTHONFRAMEWORK)!g' < "$(srcdir)/IDLE/IDLE.app/Contents/MacOS/IDLE" > "$(DESTDIR)$(PYTHONAPPSDIR)/IDLE.app/Contents/MacOS/IDLE"