[MacPorts] #38907: Resolving libjpeg-turbo + jpeg Port conflicts

[MacPorts]

#38907: Resolving libjpeg-turbo + jpeg Port conflicts
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  Reporter:  david@…        |      Owner:  rmstonecipher@…
      Type:  enhancement    |     Status:  new
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.1.3
Resolution:                 |   Keywords:
      Port:  libjpeg-turbo  |
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Comment (by rmstonecipher@…):

 Ryan, David,[[br]]
 The libjpeg-turbo [http://www.libjpeg-turbo.org/About/Jpeg-9 commentary on
 jpeg 9, SmartScale, etc.] gives me the impression that the changes to ijg
 jpeg are non-standard, academic in nature, and not widely-adopted.[[br]]
 Could we not modify the path dependency to depend on libjpeg-turbo by
 default and let jpeg 9, which seems to be drifting away from standards-
 compliance, be the alternative library?[[br]]
 Could Portfile voodoo be used to force systems upgrading jpeg-dependent
 packages to deactivate jpeg 9, install libjpeg-turbo, and rebuild against
 it?

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Ticket URL: <https://trac.macports.org/ticket/38907#comment:4>
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