--- a/runtime/spawn_subprocess.py	Wed Mar 13 10:19:30 2019 +0300
+++ b/runtime/spawn_subprocess.py	Wed Mar 13 11:47:03 2019 +0300
@@ -3,6 +3,7 @@
 
 # subset of subprocess built-in module using posix_spawn rather than fork.
 
+from __future__ import print_function
 from __future__ import absolute_import
 import os
 import signal