[MacPorts] #46749: mod_perl2: add variants +perl5_18 +perl5_20

[MacPorts]

#46749: mod_perl2:  add variants +perl5_18 +perl5_20
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 Reporter:  devans@…     |      Owner:  ryan@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  mod_perl2
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 mod_perl2 can only be built for one version of perl at a time and
 currently uses the default perl5.16.  This restricts its dependents to
 perl5.16 as well since they must match.

 An enhancement would be to add variants to optionally support perl5.18 and
 perl5.20 possibly use PortGroup active_variants or some other mechanism in
 the dependents to ensure that they are using the same perl version.

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Ticket URL: <https://trac.macports.org/ticket/46749>
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