[MacPorts] #45431: sqlgrey: absence of required perl variant, depending on variant of perl5

[MacPorts]

#45431: sqlgrey: absence of required perl variant, depending on variant of perl5
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  Reporter:  ryandesign@…  |      Owner:  pixilla@…
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.3.1
Resolution:                |   Keywords:
      Port:  sqlgrey       |
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Comment (by pixilla@…):

 The perl5 port group starts with this:
 {{{
 options perl5.default_branch perl5.branches
 default perl5.default_branch {[perl5_get_default_branch]}
 }}}

 I understood that default option values enclosed in curly-braces were
 evaluated at first use and only if not already set. Why does it appear
 that portindex behaves differently?

 In the Portfile if I set perl5.default_branch before adding the perl5 port
 group portindex completes. Can someone suggest a better solution then
 requiring the setting of perl5.default_branch before including the port
 group?

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Ticket URL: <https://trac.macports.org/ticket/45431#comment:7>
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