Dear Monks,
I work as a Perl programmer for about half a year (never studied, just served an apprenticeship) and it's my task to learn about Perl XS at present. I worked through example 4 on the perlxstut, step by step, but executing Makefile.PL gives me the error

Invalid CODE attribute: postamble at ./Makefile.PL line 44
BEGIN failed--compilation aborted at ./Makefile.PL line 49.
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The Makefile code looks like this:

#!/usr/bin/perl
use 5.008008;
use ExtUtils::MakeMaker;
# See lib/ExtUtils/MakeMaker.pm for details of how to influence
# the contents of the Makefile that is written.
WriteMakefile(
    NAME              => 'Mytest2',
    VERSION_FROM      => 'Mytest2.pm', # finds $VERSION
    PREREQ_PM         => {}, # e.g., Module::Name => 1.1
    ($] >= 5.005 ?     ## Add these new keywords supported since 5.005
      (ABSTRACT_FROM  => 'lib/Mytest2.pm', # retrieve abstract from mo
+dule
       AUTHOR         => 'A. U. Thor <a.u.thor@a.galaxy.far.far.away>'
+) : ()),
    LIBS              => [''], # e.g., '-lm'
    DEFINE            => '', # e.g., '-DHAVE_SOMETHING'
    INC               => '-I.', # e.g., '-I. -I/usr/include/other'
    MYEXTLIB => 'mylib/libmylib$(LIB_EXT)',
    # Un-comment this if you add C files to link with later:
    # OBJECT            => '$(O_FILES)', # link all the C files too
);
if  (eval {require ExtUtils::Constant; 1}) {
  # If you edit these definitions to change the constants used by this
+ module,
  # you will need to use the generated const-c.inc and const-xs.inc
  # files to replace their "fallback" counterparts before distributing
+ your
  # changes.
  my @names = (qw(TESTVAL));
  ExtUtils::Constant::WriteConstants(
                                     NAME         => 'Mytest2',
                                     NAMES        => \@names,
                                     DEFAULT_TYPE => 'IV',
                                     C_FILE       => 'const-c.inc',
                                     XS_FILE      => 'const-xs.inc',
                                  );

}
else {
  use File::Copy;
  use File::Spec;
  foreach my $file ('const-c.inc', 'const-xs.inc') {
    my $fallback = File::Spec->catfile('fallback', $file);
    copy ($fallback, $file) or die "Can't copy $fallback to $file: $!"
+;
  }
}

sub MY:postamble {
'
$(MYEXTLIB): mylib/Makefile
        cd mylib && $(MAKE) $(PASSTHRU)
';
}
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I don't get the problem and why he doesn't seem to like 'postamble'. Since I can't believe this is an error in the perldoc, I will be happy if someone tells me what I'm doing wrong.
Thanks in advance,

Michaela