On recent CURRENT and its equivalent jail for poudriere (host and jail share the same OS revision, r328409) the building of port net/stund fails:

[...]
===>  Building for stund-0.96
gmake[1]: Entering directory '/wrkdirs/usr/ports/net/stund/work/stund_0.96_Aug13'
c++  -c  -O2 -pipe -fstack-protector -fno-strict-aliasing  -Wall server.cxx -o server.o
c++  -c  -O2 -pipe -fstack-protector -fno-strict-aliasing  -Wall stun.cxx -o stun.o
c++  -c  -O2 -pipe -fstack-protector -fno-strict-aliasing  -Wall udp.cxx -o udp.o
c++  -c  -O2 -pipe -fstack-protector -fno-strict-aliasing  -Wall client.cxx -o client.o
stun.cxx:2257:17: warning: unused variable 'changedAddr' [-Wunused-variable]
   StunAddress4 changedAddr = resp.changedAddress.ipv4;
                ^
stun.cxx:2352:20: warning: unused variable 'changedAddr' [-Wunused-variable]
      StunAddress4 changedAddr = resp.changedAddress.ipv4;
                   ^
udp.cxx:67:57: error: invalid operands to binary expression ('__bind<int &, sockaddr *, unsigned long>' and 'int')
   if ( bind( fd,(struct sockaddr*)&addr, sizeof(addr)) != 0 )
        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ^  ~
/usr/include/c++/v1/system_error:606:1: note: candidate function not viable: no known conversion from '__bind<int &, sockaddr *, unsigned long>' to 'const std::__1::error_code' for 1st argument
operator!=(const error_code& __x, const error_code& __y) _NOEXCEPT
^
/usr/include/c++/v1/system_error:611:1: note: candidate function not viable: no known conversion from '__bind<int &, sockaddr *, unsigned long>' to 'const std::__1::error_code' for 1st argument
operator!=(const error_code& __x, const error_condition& __y) _NOEXCEPT
^
/usr/include/c++/v1/system_error:616:1: note: candidate function not viable: no known conversion from '__bind<int &, sockaddr *, unsigned long>' to 'const std::__1::error_condition' for 1st argument
operator!=(const error_condition& __x, const error_code& __y) _NOEXCEPT
^
/usr/include/c++/v1/system_error:621:1: note: candidate function not viable: no known conversion from '__bind<int &, sockaddr *, unsigned long>' to 'const std::__1::error_condition' for 1st argument
operator!=(const error_condition& __x, const error_condition& __y) _NOEXCEPT
^
/usr/include/c++/v1/utility:564:1: note: candidate template ignored: could not match 'pair' against '__bind'
operator!=(const pair<_T1,_T2>& __x, const pair<_T1,_T2>& __y)