diff -up serf-1.3.9/SConstruct.python3 serf-1.3.9/SConstruct
--- serf-1.3.9/SConstruct.python3	2018-07-02 17:21:47.331685070 +0200
+++ serf-1.3.9/SConstruct	2018-07-02 17:27:12.316413515 +0200
@@ -20,6 +20,8 @@
 # ====================================================================
 #
 
+from __future__ import print_function
+
 import sys
 import os
 import re
@@ -166,7 +168,7 @@ env.Append(BUILDERS = {
 match = re.search('SERF_MAJOR_VERSION ([0-9]+).*'
                   'SERF_MINOR_VERSION ([0-9]+).*'
                   'SERF_PATCH_VERSION ([0-9]+)',
-                  env.File('serf.h').get_contents(),
+                  env.File('serf.h').get_contents().decode('utf-8'),
                   re.DOTALL)
 MAJOR, MINOR, PATCH = [int(x) for x in match.groups()]
 env.Append(MAJOR=str(MAJOR))
@@ -183,7 +185,7 @@ CALLOUT_OKAY = not (env.GetOption('clean
 
 unknown = opts.UnknownVariables()
 if unknown:
-  print 'Warning: Used unknown variables:', ', '.join(unknown.keys())
+  print('Warning: Used unknown variables:', ', '.join(unknown.keys()))
 
 apr = str(env['APR'])
 apu = str(env['APU'])