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cpan broken ???

 Hello everyone!

 I am trying to install a Perl module via CPAN and it fails:
--- cut ---
$ cpan install Parallel::ForkManager
CPAN: Storable loaded ok (v2.62)
Reading '/home/p.fedin/.cpan/Metadata'
  Database was generated on Mon, 05 Feb 2018 12:17:02 GMT
Running install for module 'Parallel::ForkManager'
CPAN: Digest::SHA loaded ok (v6.01)
CPAN: Compress::Zlib loaded ok (v2.074)
Checksum for /home/p.fedin/.cpan/sources/authors/id/Y/YA/YANICK/Parallel-ForkManager-1.19.tar.gz ok
'YAML' not installed, will not store persistent state
CPAN: CPAN::Meta::Requirements loaded ok (v2.140)
CPAN: Parse::CPAN::Meta loaded ok (v2.150010)
CPAN: CPAN::Meta loaded ok (v2.150010)
The content of '/home/p.fedin/.cpan/build/Parallel-ForkManager-1.19-6/META.json' is not a HASH reference. Cannot use it.
Configuring Y/YA/YANICK/Parallel-ForkManager-1.19.tar.gz with Makefile.PL
Checking if your kit is complete...
Looks good
Warning: prerequisite Test::Warn 0 not found.
Could not load PERL_YAML_BACKEND 'YAML'
 at /usr/share/perl5/5.26/CPAN/Meta.pm line 622.
Warning: No success on command[/usr/bin/perl Makefile.PL]
  YANICK/Parallel-ForkManager-1.19.tar.gz
  /usr/bin/perl Makefile.PL -- NOT OK

--- cut ---
 I've just updated; the system is x86-64. How to fix this?

Kind regards,
Pavel Fedin
Senior Engineer
Samsung Electronics Research center Russia




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