[MacPorts] #55706: gle-graphics @4.2.5: build failure under 10.13

[MacPorts]

#55706: gle-graphics @4.2.5: build failure under 10.13
----------------------------+--------------------------
 Reporter:  majoc-at-astro  |      Owner:
     Type:  defect          |     Status:  new
 Priority:  Normal          |  Milestone:
Component:  ports           |    Version:  2.4.2
 Keywords:                  |       Port:  gle-graphics
----------------------------+--------------------------
 clang++ seems to get mightily confused when compiling ffitcontour.cpp;
 please see enclosed logfile.

 === macOS 10.13.2 ===
  * '''BuildVersion''':  17C205

 === Xcode 9.2 ===
  * '''Xcode''': Build version 9C40b
  * '''clang''': Apple LLVM version 9.0.0 (clang-900.0.39.2)

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Ticket URL: <https://trac.macports.org/ticket/55706>
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