[MacPorts] #18602: Prevent MacPorts from being configured with --prefix=/usr/local

[MacPorts]

#18602: Prevent MacPorts from being configured with --prefix=/usr/local
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  Reporter:  ryandesign@…             |       Owner:  macports-tickets@…                   
      Type:  defect                   |      Status:  closed                               
  Priority:  Normal                   |   Milestone:  MacPorts 1.8.0                       
 Component:  base                     |     Version:  1.7.0                                
Resolution:  fixed                    |    Keywords:                                       
      Port:                           |  
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Comment(by jmr@…):

 The reasons why we don't default to installing in /usr/local are covered
 in the FAQ. I don't recall any reason being given for disabling it
 entirely beyond it breaking macfuse. I pointed out to blb at the time that
 there might be users with a legitimate reason to use it, and he responded
 that we could relax the restriction if anyone complained, by adding a --i
 -understand-that-usr-local-is-unsupported configure option or whatever.
 So, now someone has complained (for the first time as far as I'm aware).

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Ticket URL: <https://trac.macports.org/ticket/18602#comment:6>
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