Re: Q about prerequisites

[David Golden]

On Thu, Mar 25, 2010 at 11:04 PM,  <cr...@animalhead.com> wrote:
> Your comment "put that in a section that only runs..."
> has me all confused.
> I just put CONFIGURE_REQUIRES => {EU:MM => 6.56} into Makefile.PL.
> It went into META.yml.
>
> This is a small module and has no "sections" that I can think of.
> What do you mean?

Here is an example from Module-Starter.  Note the (eval {
ExtUtils::MakeMaker->VERSION(...) }) stanzas, which avoid older EU::MM
from complaining about invalid arguments to WriteMakefile;

  WriteMakefile(
      NAME                => 'Module::Starter',
      AUTHOR              => 'Andy Lester <a...@petdance.com>',
      VERSION_FROM        => 'lib/Module/Starter.pm',
      (eval { ExtUtils::MakeMaker->VERSION(6.21) } ? (LICENSE => 'perl') : ()),
      ABSTRACT_FROM       => 'lib/Module/Starter.pm',
      EXE_FILES           => [ 'bin/module-starter' ],
      PREREQ_PM => {
          'Test::More'            => 0,
          'Test::Harness'         => 0.21,
          'ExtUtils::Command'     => 0,
          'File::Spec'            => 0,
          'Getopt::Long'          => 0,
          'Pod::Usage'            => 1.21,
      },
      (! eval { ExtUtils::MakeMaker->VERSION(6.46) } ? () :
          (META_ADD => {
              resources => {
                  homepage   => 'http://code.google.com/p/module-starter/',
                  repository =>
'http://module-starter.googlecode.com/svn/trunk/',
                  bugtracker =>
'http://rt.cpan.org/NoAuth/Bugs.html?Dist=Module-Starter',
              },
          })
      ),
      dist                => { COMPRESS => 'gzip -9f', SUFFIX => 'gz', },
      clean               => { FILES => 'Module-Release-*' },
  );

Some Makefile.PL's do it slightly differently, by putting all args
into something like %WriteMakefileArgs and then deleting them out
before calling WriteMakefile:

  delete $WriteMakefileArgs{LICENSE}
    unless eval { ExtUtils::MakeMaker->VERSION(6.31) };

  WriteMakefile(%WriteMakefileArgs);

I hope that clarifies what I meant.

-- David