[MacPorts] #50955: qwt61 does not build for variant +qt5

[MacPorts]

#50955: qwt61 does not build for variant +qt5
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  Reporter:  benjamin.seppke@…  |      Owner:  michaelld@…
      Type:  defect             |     Status:  new
  Priority:  Normal             |  Milestone:
 Component:  ports              |    Version:  2.3.4
Resolution:                     |   Keywords:
      Port:  qwt61              |
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Comment (by rjvbertin@…):

 No, your install_name_tool commands or similar are still required. There
 must be a better way to do that though, one where all dependents built by
 the port itself (the Designer plugin, the examples) use the correct rpath.

 FWIW, building on Linux has the same issue; the build system is designed
 with the idea in mind that the libraries are installed somewhere where the
 dynamic loader (dyld, ld.so on Linux) can find them.

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Ticket URL: <https://trac.macports.org/ticket/50955#comment:14>
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