Suppress warnings when byte-compiling the installed library modules.
This seems the sanest thing to do.
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 8bb3fc6..1234dd6 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -669,10 +669,11 @@
 	done
 	$(INSTALL_DATA) $(srcdir)/LICENSE $(LIBDEST)/LICENSE.txt
 	PYTHONPATH=$(LIBDEST)  $(RUNSHARED) \
-		./$(BUILDPYTHON) -tt $(LIBDEST)/compileall.py -x badsyntax \
-	        $(LIBDEST)
+		./$(BUILDPYTHON) -Wi -tt $(LIBDEST)/compileall.py \
+		-x badsyntax $(LIBDEST)
 	PYTHONPATH=$(LIBDEST) $(RUNSHARED) \
-		./$(BUILDPYTHON) -O $(LIBDEST)/compileall.py -x badsyntax $(LIBDEST)
+		./$(BUILDPYTHON) -Wi -tt -O $(LIBDEST)/compileall.py \
+		-x badsyntax $(LIBDEST)
 
 # Create the PLATDIR source directory, if one wasn't distributed..
 $(srcdir)/Lib/$(PLATDIR):