[MacPorts] #55293: set ${prefix} in portindex

[MacPorts]

#55293: set ${prefix} in portindex
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  Reporter:  RJVB         |      Owner:
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  base         |    Version:
Resolution:               |   Keywords:
      Port:               |
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Comment (by ryandesign):

 If `portindex` is seeing that `if` statement, it must be in the main part
 of the portfile, not inside a phase. What are you doing in response to
 this `if` statement? If you're causing the port to, for example, declare
 different dependencies based on what other ports are already installed,
 then I would say we do not want to do that, because it would cause the
 index to be generated differently on different systems.

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Ticket URL: <https://trac.macports.org/ticket/55293#comment:6>
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