[bug #52175] Build fails with Xcode 9 on macOS 10.13

[FX]

URL:
  <http://savannah.gnu.org/bugs/?52175>

                 Summary: Build fails with Xcode 9 on macOS 10.13
                 Project: DDD
            Submitted by: fxcoudert
            Submitted on: Thu 05 Oct 2017 06:51:31 PM UTC
                Category: Build
                Severity: 3 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                 Release: None

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Details:

Build of ddd-3.3.12.tar.gz on macOS 10.13 with system compiler (Xcode 9) leads
to many errors of the form:

In file included from LabelH.C:36:
In file included from /usr/local/include/Xm/XmP.h:40:
In file included from /usr/local/include/Xm/Xm.h:59:
In file included from /opt/X11/include/X11/Intrinsic.h:53:
In file included from /opt/X11/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:
erro
r: 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
              ^





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