[MacPorts] #57493: esmf @7_1_0r +gcc8: build error: 'size_t' does not name a type

[MacPorts]

#57493: esmf @7_1_0r +gcc8: build error: 'size_t' does not name a type
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  Reporter:  Dave-Allured  |      Owner:  tenomoto
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:                |   Keywords:
      Port:  esmf          |
---------------------------+----------------------

Comment (by tenomoto):

 +gcc7 also fails. This must be related to removal of /usr/include in
 Mojave. clang probably points headers from SDK. Setting isysroot may help.

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Ticket URL: <https://trac.macports.org/ticket/57493#comment:3>
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