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In a Perl distribution, what would be the recommended way to specify a "dependency" type that says: update these modules to at least these versions, if you have them installed?

I would do something like (untested):

In the Makefile.PL, list all dependencies along with their minimum required versions:
... my %min_version = (Some/Place/ => 0.06, # need at least version +0.06 of Some::Place::Foo Other/Spot/ => 1.35, # need at least version +1.35 of Other::Spot::Bar => 2.72, # need at least version +2.72 of Baz ); my @prereqs; for(keys(%min_version)) { eval {require $_}; # Ignore modules that don't load. unless($@){ my $m = $_; $m =~ s/\//::/g; $m =~ s/\.pm$//; my $v = $min_version{$_}; push @prereqs($m, $v); } } my %h = @prereqs; ....
And then, in WriteMakefile() section of the Makefile.PL, I would specify:
... 'PREREQ_PM' => \%h, ...

In reply to Re: Update these modules if installed? by syphilis
in thread Update dependants if installed (was: Update these modules if installed?) by perlancar

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