[MacPorts] #55342: ddd @3.3.12_3 build: LabelH.C error: unknown type name 'a_class'; did you mean 'class'?

[MacPorts]

#55342: ddd @3.3.12_3 build: LabelH.C error: unknown type name 'a_class'; did you
mean 'class'?
------------------------+-----------------
 Reporter:  p-bro       |      Owner:
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:  highsierra  |       Port:  ddd
------------------------+-----------------
 ddd fails to build on High Sierra (10.13.1) after a migration upgrade from
 El Capitan. The first error appears in the build process, when compiling
 LabelH.C, while including an Xcode file:
 {{{
 /usr/bin/clang++ -DHAVE_CONFIG_H -I.  -I./..  -I/opt/local/include  -Os
 -Wall -W -Wwrite-strings -pipe -stdlib=libc++ -arch x86_64 -trigraphs  -MT
 LabelH.o -MD -MP -MF .deps/LabelH.Tpo -c -o LabelH.o LabelH.C
 In file included from LabelH.C:36:
 In file included from /opt/local/include/Xm/XmP.h:45:
 In file included from /opt/local/include/Xm/Xm.h:59:
 In file included from /opt/local/include/X11/Intrinsic.h:53:
 In file included from /opt/local/include/X11/Xlib.h:51:
 In file included from
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/stddef.h:51:
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/__nullptr:35:15:
 error: unknown type name 'a_class'; did you mean 'class'?
     template <class _Tp>
               ^
 LabelH.C:34:15: note: expanded from macro 'class'
 #define class a_class
               ^
 }}}

 The full log from port -d install is attached. Xcode is at 9.1 (9B55).

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Ticket URL: <https://trac.macports.org/ticket/55342>
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