Virtual box require LIBCXX

[Nilton Jose Rizzo]

I finish install a virtual box from ports and it's build ok, look

===>   Installing ldconfig configuration file
===>   Registering installation for virtualbox-ose-4.2.18_1
Installing virtualbox-ose-4.2.18_1... done
===> SECURITY REPORT: 
      This port has installed the following binaries which execute with
      increased privileges.
/usr/local/lib/virtualbox/VirtualBox
/usr/local/lib/virtualbox/VBoxSDL
/usr/local/lib/virtualbox/VBoxHeadless
/usr/local/lib/virtualbox/VBoxAutostart
/usr/local/lib/virtualbox/VBoxBFE
/usr/local/lib/virtualbox/VBoxTestOGL
/usr/local/lib/virtualbox/VBoxNetAdpCtl
/usr/local/lib/virtualbox/VBoxNetDHCP

      This port has installed the following files which may act as network
      servers and may therefore pose a remote security risk to the system.
/usr/local/lib/virtualbox/vboxwebsrv
/usr/local/lib/virtualbox/VBoxXPCOM.so
/usr/local/lib/virtualbox/VBoxRT.so
/usr/local/lib/virtualbox/VBoxDD.so
/usr/local/lib/virtualbox/VBoxOGLhostcrutil.so (USES POSSIBLY INSECURE
FUNCTIONS: tmpnam)
/usr/local/lib/virtualbox/webtest

      This port has installed the following startup scripts which may cause
      these network services to be started at boot time.
/usr/local/etc/rc.d/vboxheadless
/usr/local/etc/rc.d/vboxwebsrv

      If there are vulnerabilities in these programs there may be a security
      risk to the system. FreeBSD makes no guarantee about the security of
      ports included in the Ports Collection. Please type 'make deinstall'
      to deinstall the port if this is a concern.

      For more information, and contact details about the security
      status of this software, see the following webpage: 
http://www.virtualbox.org/
===>  Cleaning for dev86-0.16.18
===>  Cleaning for kBuild-0.1.9998
===>  Cleaning for gtar-1.27
===>  Cleaning for gsoap-2.8.10_1
===>  Cleaning for libvncserver-0.9.9_5
===>  Cleaning for virtualbox-ose-kmod-4.2.18
===>  Cleaning for virtualbox-ose-4.2.18_1
root at valfenda:/usr/ports/emulators/virtualbox-ose # kldload vboxdrv
root at valfenda:/usr/ports/emulators/virtualbox-ose # 

but whern I run it, the I got this error message:
rizzo at valfenda:~/src/Doutorado/visao/testes % VirtualBox 
VirtualBox: Error -610 in supR3HardenedMainInitRuntime!
VirtualBox: dlopen("/usr/local/lib/virtualbox/VBoxRT.so",) failed:
/usr/local/lib/compat/libstdc++.so.6: version GLIBCXX_3.4.15 required by
/usr/local/lib/virtualbox/VBoxRT.so not found

VirtualBox: Tip! It may help to reinstall VirtualBox.
rizzo at valfenda:~/src/Doutorado/visao/testes % 

I update my system and port to last nigth
root at valfenda:/home2/rizzo # cd /usr
root at valfenda:/usr # svn info src
Caminho: src
Working Copy Root Path: /usr/src
URL: svn://svn.freebsd.org/base/head
Relative URL: ^/head
Raiz do Repositório: svn://svn.freebsd.org/base
UUID do repositório: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Revisão: 256108
Tipo de Nó: diretório
Agendado: normal
Autor da Última Mudança: glebius
Revisão da Última Mudança: 256108
Data da Última Mudança: 2013-10-07 09:07:40 -0300 (Seg, 07 Out 2013)

root at valfenda:/usr # svn info ports
Caminho: ports
Working Copy Root Path: /usr/ports
URL: svn://svn.freebsd.org/ports/head
Relative URL: ^/head
Raiz do Repositório: svn://svn.freebsd.org/ports
UUID do repositório: 35697150-7ecd-e111-bb59-0022644237b5
Revisão: 329758
Tipo de Nó: diretório
Agendado: normal
Autor da Última Mudança: ak
Revisão da Última Mudança: 329758
Data da Última Mudança: 2013-10-08 02:47:27 -0300 (Ter, 08 Out 2013)

root at valfenda:/usr # uname -a
FreeBSD valfenda 10.0-ALPHA5 FreeBSD 10.0-ALPHA5 #3 r256108: Tue Oct  8
02:55:04 BRT 2013     rizzo at valfenda:/usr/obj/usr/src/sys/VALFENDA  amd64
root at valfenda:/usr # 


What's do I wrong?

TIA,

  Rizzo