diff --git a/openpgm/pgm/SConscript.autoconf b/openpgm/pgm/SConscript.autoconf
index d3d833d..abcfd94 100644
--- a/openpgm/pgm/SConscript.autoconf
+++ b/openpgm/pgm/SConscript.autoconf
@@ -113,7 +113,7 @@ def CheckMember (context, member, header):
 int
 main ()
 {
-	offsetof (""" + string.replace (member, '.', ', ') + """);
+	offsetof (""" + member.replace('.', ', ') + """);
 	return 0;
 }
 	"""
diff --git a/openpgm/pgm/SConstruct b/openpgm/pgm/SConstruct
index adff0b7..d408945 100644
--- a/openpgm/pgm/SConstruct
+++ b/openpgm/pgm/SConstruct
@@ -116,7 +116,7 @@ release = env.Clone(BUILD = 'release')
 release.Append(CCFLAGS = '-O2')
 
 debug = env.Clone(BUILD = 'debug')
-debug.Append(CCFLAGS = ['-DPGM_DEBUG','-ggdb'], LINKFLAGS = '-gdb')
+debug.Append(CCFLAGS = ['-DPGM_DEBUG','-ggdb'], LINKFLAGS = '-ggdb')
 
 profile = env.Clone(BUILD = 'profile')
 profile.Append(CCFLAGS = ['-O2','-pg'], LINKFLAGS = '-pg')
@@ -206,15 +206,15 @@ if env['WITH_SNMP'] == 'true':
 conf = Configure(env, custom_tests = tests);
 
 if env['WITH_SNMP'] == 'true' and not conf.CheckSNMP():
-	print 'Net-SNMP libraries not compatible.';
+	print ('Net-SNMP libraries not compatible.');
 	Exit(1);
 
 if env['WITH_CHECK'] == 'true' and conf.CheckCheck():
-	print 'Enabling Check unit tests.';
+	print ('Enabling Check unit tests.');
 	conf.env['CHECK'] = 'true';
 	env['CHECK_FLAGS'] = env.ParseFlags('!pkg-config --cflags --libs check');
 else:
-	print 'Disabling Check unit tests.';
+	print ('Disabling Check unit tests.');
 	conf.env['CHECK'] = 'false';
 
 env = conf.Finish();
@@ -236,7 +236,7 @@ env.Append(BUILDERS = {'StaticSharedLibrary': pic_lib});
 #-----------------------------------------------------------------------------
 
 ref_node = 'ref/' + env['BUILD'] + '-' + platform.system() + '-' + platform.machine() + '/';
-BuildDir(ref_node, '.', duplicate=0)
+VariantDir(ref_node, '.', duplicate=0)
 
 env.Append(CPPPATH = [
 # $(top_builddir)/include