[MacPorts] #50806: gnuplot on ElCapitan fails due to Symbol not found

[MacPorts]

#50806: gnuplot on ElCapitan fails due to Symbol not found
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  Reporter:  chlangley@…  |      Owner:  mojca@…
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  gnuplot      |
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Comment (by cal@…):

 Ruby's gem build systems are known to set DYLD_LIBRARY_PATH. In this case
 DYLD_LIBRARY_PATH is probably set to /opt/local/lib which contains
 additional libraries when you try to build your gem. The correct fix is
 not to set DYLD_LIBRARY_PATH; it's almost always wrong to do so and leads
 to problems like the one you've seen.

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Ticket URL: <https://trac.macports.org/ticket/50806#comment:9>
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