Yes, using sudo apt-get install libdatetime-perl seems a good idea, especially for a basic module such as DateTime, which seems a useful thing to have around. Not so sure I want to clutter /usr with every Cpan Module I fancy trying out and might never use again. So I did that, and then got: 

cpan[1]> m DateTime
CPAN: Storable loaded ok (v2.41)
Reading '/usr/local/CPAN/Metadata'
  Database was generated on Tue, 16 Jun 2015 21:53:20 GMT
Module id = DateTime
    CPAN_USERID  DROLSKY (Dave Rolsky <autarch@urth.org>)
    CPAN_VERSION 1.19
    CPAN_FILE    D/DR/DROLSKY/DateTime-1.19.tar.gz
    UPLOAD_DATE  2015-05-31
    MANPAGE      DateTime - A date and time object
    INST_FILE    /usr/lib/perl5/DateTime.pm
    INST_VERSION 1.06

[download]
So it had actually installed v1.06 (presumably the latest Ubuntu had got around to) although it knew that a later v1.19 existed.

Fortunately, my application did not care about that version, but promptly declared that what it really wanted was DateTime/Format/Mail.pm, which then downloaded via Cpan; my application then ran, and hit a bug which I shall now have to sort out.

In reply to Re^2: Upgrading XS module to later version by clerew
in thread Upgrading XS module to later version by clerew

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