Test tweak ($Config{useperlio} is by default undef) .

p4raw-id: //depot/perl@7548

diff --git a/t/lib/b.t b/t/lib/b.t
index fca7f47..2bca033 100755 (executable)
--- a/t/lib/b.t
+++ b/t/lib/b.t
@@ -126,7 +126,7 @@ ok;
 
 chomp($a = `$^X "-I../lib" "-MB::Stash" "-Mwarnings" -e1`);
 $a = join ',', sort split /,/, $a;
-$a =~ s/-uperlio(?:::\w+)?,//g if $Config{'useperlio'} eq 'define';
+$a =~ s/-uperlio(?:::\w+)?,//g if defined $Config{'useperlio'} and $Config{'useperlio'} eq 'define';
 $a =~ s/-uWin32,// if $^O eq 'MSWin32';
 $a =~ s/-u(Cwd|File|File::Copy|OS2),//g if $^O eq 'os2';
 $a =~ s/-uCwd,// if $^O eq 'cygwin';