[MacPorts] #30638: perl5 portgroup: resolve version ambiguity with subports

[MacPorts]

#30638: perl5 portgroup: resolve version ambiguity with subports
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 Reporter:  jmr@…             |       Owner:  macports-tickets@…                   
     Type:  enhancement       |      Status:  new                                  
 Priority:  Normal            |   Milestone:                                       
Component:  ports             |     Version:                                       
 Keywords:                    |        Port:                                       
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 Currently, perl modules are built against whatever version of perl happens
 to be linked to ${prefix}/bin/perl. This causes much confusion and is
 incompatible with prebuilt binaries.

 Attached is a proposed change. It takes a similar approach to the new
 unified python portgroup, creating several p5.X-foo ports from each p5-foo
 portfile. This way, p5.X-foo is known to be built against perl5.X. The
 p5-foo port itself becomes a metaport that pulls in one of the specific
 versions.

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Ticket URL: <https://trac.macports.org/ticket/30638>
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