[MacPorts] #54925: Can no longer build Root6

[MacPorts]

#54925: Can no longer build Root6
-----------------------------------+-------------------
 Reporter:  AlexanderLarsRobinson  |      Owner:
     Type:  defect                 |     Status:  new
 Priority:  Normal                 |  Milestone:
Component:  ports                  |    Version:  2.4.1
 Keywords:                         |       Port:  root6
-----------------------------------+-------------------
 A series of port upgrades was unexpectedly aborted yesterday by root6.10
 failing to build.  I ignored this until today, whereupon the port being
 'broken' (but still working) yet unable to be rebuilt was blocking the
 installation of new ports.  I made the mistake of uninstalling root6 to
 reinstall it, and now am no longer able to do my job because it simply
 won't build.

 Versions and variants tested (cleaning between each):
 root6
 @6.08.06+clang39+cocoa+cxx14+gcc6+graphviz+gsl+http+minuit2+opengl+python34+roofit+soversion+ssl+tmva+xml
 (this is what was installed)
 root6
 @6.10.04_3+cocoa+cxx17+gcc7+graphviz+gsl+http+minuit2+opengl+python34+roofit+soversion+ssl+tmva+veccore+xml
 (root6 +python34)
 root6 @6.08.06+python34
 root6
 @6.10.04_3+cocoa+cxx17+gcc6+graphviz+gsl+http+minuit2+opengl+python34+roofit+soversion+ssl+tmva+veccore+xml
 root6 +python27 (using build instead of install to bypass the binaries)

 The error occurs quite late, after about a half-hour of compiling.  I'm
 attaching the logs for last four.  They are all about identical, and I
 find them equally unhelpful.  Maybe someone else will understand the
 problem.  The python27 variant can be installed via binaries, but this is
 of no use to me as I need the python34 variant.

 This is on MacOS Sierra with Xcode 9.0.  Rebooting the computer did not
 help.

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Ticket URL: <https://trac.macports.org/ticket/54925>
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