[MacPorts] #55963: wgrib2 build fail - log shows errors when compiling gctpc.c

[MacPorts]

#55963: wgrib2 build fail - log shows errors when compiling gctpc.c
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  Reporter:  GeneralDuke9  |      Owner:  tenomoto
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.2
Resolution:                |   Keywords:
      Port:  wgrib2        |
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Changes (by ryandesign):

 * cc: ryandesign (added)


Comment:

 The missing symbols are defined in /opt/local/include/gctpc/proj.h.

 The problem is that wgrib2 depends on proj, and proj provides the
 completely unrelated file /opt/local/include/proj.h which doesn't define
 those symbols, and the build system finds this file first, because the
 portfile supplies the `-I` flags to the build system in the wrong order.

 proj was recently updated to version 5.0.0. Previous versions of proj did
 not provide a file called /opt/local/include/proj.h so the problem did not
 exist before.

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Ticket URL: <https://trac.macports.org/ticket/55963#comment:2>
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