--- a/Makefile.PL	2006-10-01 21:28:25.000000000 +0000

+++ b/Makefile.PL	2014-01-23 15:40:56.784222851 +0000

@@ -4,7 +4,8 @@

 use ExtUtils::MakeMaker;

 use Config;

-unless ($Config{useperlio} eq 'define' and $Config{usesfio} eq 'false') {

+unless ($Config{useperlio} eq 'define' and

+	(defined($Config{usesfio}) ? $Config{usesfio} : 'false') eq 'false') {

   die <<BARF;

 You need perl 5.8.0 or later, configured to use perlio (and not to use sfio)

 BARF