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pan fails to build with glib 2.68

Here is how it fails

root@build-vm:/build/pan-0.146# make
make  all-recursive
make[1]: Entering directory '/build/pan-0.146'
Making all in .
make[2]: Entering directory '/build/pan-0.146'
make[2]: Leaving directory '/build/pan-0.146'
Making all in uulib
make[2]: Entering directory '/build/pan-0.146/uulib'
make[2]: Nothing to be done for 'all'.
make[2]: Leaving directory '/build/pan-0.146/uulib'
Making all in pan
make[2]: Entering directory '/build/pan-0.146/pan'
Making all in general
make[3]: Entering directory '/build/pan-0.146/pan/general'
  CXX      file-util.o
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from file-util.cc:30:
/usr/include/c++/10.2.0/type_traits:56:3: error: template with C linkage
   56 |   template<typename _Tp, _Tp __v>
      |   ^~~~~~~~
file-util.cc:25:1: note: ‘extern "C"’ linkage started here
   25 | extern "C"
      | ^~~~~~~~~~
In file included from /usr/include/glib-2.0/glib/gatomic.h:31,
                 from /usr/include/glib-2.0/glib/gthread.h:32,
                 from /usr/include/glib-2.0/glib/gasyncqueue.h:32,
                 from /usr/include/glib-2.0/glib.h:32,
                 from file-util.cc:30:
/usr/include/c++/10.2.0/type_traits:71:3: error: template with C linkage