perl versioning problem, how to get beyond for @world

[Harry Putnam <reader@newsguy.com>]

I have a light minimalish system (noX) and not a lot installed but for a the
last few weeks, when I try to update with emerge -vuD world

It caves about a perl versioning problem, and specifically about:
  perl-core/Module-Build-0.400.0

Abbreviated output:
,----
| >>> Emerging (1 of 12) perl-core/Module-Build-0.400.0
|  * Module-Build-0.40.tar.gz RMD160 SHA1 SHA256 size ;-) ...                    
|                       [ ok ]
| >>> cfg-update-1.8.2-r1: Checksum index is up-to-date ...
| >>> Unpacking source...
| >>> Unpacking Module-Build-0.40.tar.gz to
| /var/tmp/portage/perl-core/Module-Build-0.400.0/work
| >>> Source unpacked in /var/tmp/portage/perl-core/Module-Build-0.400.0/work
| >>> Preparing source in
| /var/tmp/portage/perl-core/Module-Build-0.400.0/work/Module-Build-0.40 ...
| >>> Source prepared.
| >>> Configuring source in
| /var/tmp/portage/perl-core/Module-Build-0.400.0/work/Module-Build-0.40 ...
|  * Using Module::Build
|  * perl Build.PL --installdirs=vendor --libdoc=
| --destdir=/var/tmp/portage/perl-core/Module-Build-0.400.0/ima
| ge/ --create_packlist=0
| *** BOOTSTRAPPING version ***
| Checking prerequisites...
|   build_requires:
|     !  Parse::CPAN::Meta (1.40) is installed, but we need version >=
|     1.4401
| ERRORS/WARNINGS FOUND IN PREREQUISITES.  You may wish to install the versions
| of the modules indicated above before proceeding with this installation
| 
| Could not create MYMETA files
| Creating new 'Build' script for 'Module-Build' version '0.40'
| Copied META.yml to MYMETA.yml for bootstrapping
| 
| These additional prerequisites must be installed:
|   requires:
|     ! version (we need version 0.87)
| >>> Source configured.
| >>> Compiling source in
| /var/tmp/portage/perl-core/Module-Build-0.400.0/work/Module-Build-0.40 ...
| version version 0.87 required--this is only version 0.82 at
| /usr/lib/perl5/vendor_perl/5.12.4/Module/Metadata
| .pm line 20.
| [...]
`----

I can't really see what to do about this...

What is installed is:

,----
| # eix -Ic|grep  Parse.*Meta
| [I] perl-core/Parse-CPAN-Meta (1.440.400@05/03/12): Parse META.yml and other
| similar CPAN metadata files
| [I] virtual/perl-Parse-CPAN-Meta (1.440.400@04/25/12): Virtual for Parse-CPAN-Meta
`----