[MacPorts] #58659: nghttp2: fails to build with non-standard xcode path

[MacPorts]

#58659: nghttp2: fails to build with non-standard xcode path
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  Reporter:  lkraider  |      Owner:  Schamschula
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.5.4
Resolution:            |   Keywords:
      Port:  nghttp2   |
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Comment (by Schamschula):

 I wonder how many users install Xcode in /Users/*/Applications.

 There is nothing in the nghttp2 Portfile that provides a path to Xcode.
 That said, it seems that in this case MacPorts python somehow sets
 {{{sysroot}}} to "". I think {{{CMAKE_SYSROOT}}} needs to be set.

 However, there is no standard way to determine the path to Xcode.

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Ticket URL: <https://trac.macports.org/ticket/58659#comment:1>
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