[Bug 273671] comms/sdr-wspr: Fails to build with GCC 13: error: expected identifier before '__is_convertible'

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273671

            Bug ID: 273671
           Summary: comms/sdr-wspr: Fails to build with GCC 13: error:
                    expected identifier before '__is_convertible'
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: salvadore@freebsd.org
                CC: jeff@baitis.net
            Blocks: 273397
             Flags: maintainer-feedback?(jeff@baitis.net)
                CC: jeff@baitis.net

This bug report blocks the update of GCC_DEFAULT to 13. This webpage can help
finding ta fix: https://gcc.gnu.org/gcc-13/porting_to.html 

In file included from /usr/include/c++/v1/math.h:309,
                 from /usr/include/c++/v1/cmath:308,
                 from /usr/include/c++/v1/complex:235,
                 from
/wrkdirs/usr/ports/comms/sdr-wspr/work/sdr-wspr-0.1.0/libwspr/wspr.hh:5,
                 from
/wrkdirs/usr/ports/comms/sdr-wspr/work/sdr-wspr-0.1.0/libwspr/wspr.cc:1:
/usr/include/c++/v1/type_traits:1770:8: error: expected identifier before
'__is_convertible'
 1770 | struct __is_convertible
      |        ^~~~~~~~~~~~~~~~

Full log:
https://pkg-status.freebsd.org/package18/data/124amd64-default-foo/2023-09-06_17h55m19s/logs/errors/sdr-wspr-0.1.0_12.log


Referenced Bugs:

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273397
[Bug 273397] [exp-run] Update GCC_DEFAULT to 13 etc.
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