virtualbox error via ports installiation

[Giorgos Tsiapaliokas]

hello,

i am trying to install virtualbox via the port system but an error comes up
:(

===>  Vulnerability check disabled, database not found
> ===>  License accepted by the user
> ===>  Found saved configuration for virtualbox-ose-3.2.6
> ===>  Extracting for virtualbox-ose-3.2.6
> => MD5 Checksum OK for VirtualBox-3.2.6-OSE.tar.bz2.
> => SHA256 Checksum OK for VirtualBox-3.2.6-OSE.tar.bz2.
> => MD5 Checksum OK for VBoxGuestAdditions_3.2.6.iso.
> => SHA256 Checksum OK for VBoxGuestAdditions_3.2.6.iso.
> ===>  Patching for virtualbox-ose-3.2.6
> ===>  Applying FreeBSD patches for virtualbox-ose-3.2.6
> ===>   virtualbox-ose-3.2.6 depends on executable: yasm - found
> ===>   virtualbox-ose-3.2.6 depends on executable: as86 - found
> ===>   virtualbox-ose-3.2.6 depends on executable: xsltproc - found
> ===>   virtualbox-ose-3.2.6 depends on executable: kmk - found
> ===>   virtualbox-ose-3.2.6 depends on file:
> /usr/local/bin/easy_install-2.6 - found
> ===>   virtualbox-ose-3.2.6 depends on file: /usr/local/bin/python2.6 -
> found
> ===>   virtualbox-ose-3.2.6 depends on file:
> /usr/local/libdata/pkgconfig/inputproto.pc - found
> ===>   virtualbox-ose-3.2.6 depends on file:
> /usr/local/libdata/pkgconfig/xcursor.pc - found
> ===>   virtualbox-ose-3.2.6 depends on file:
> /usr/local/libdata/pkgconfig/xmu.pc - found
> ===>   virtualbox-ose-3.2.6 depends on file:
> /usr/local/libdata/pkgconfig/xinerama.pc - found
> ===>   virtualbox-ose-3.2.6 depends on file: /usr/local/lib/qt4/libQtGui.so
> - found
> ===>   virtualbox-ose-3.2.6 depends on file: /usr/local/bin/linguist-qt4 -
> found
> ===>   virtualbox-ose-3.2.6 depends on file: /usr/local/bin/moc-qt4 - found
> ===>   virtualbox-ose-3.2.6 depends on file:
> /usr/local/lib/qt4/libQtNetwork.so - found
> ===>   virtualbox-ose-3.2.6 depends on file: /usr/local/bin/rcc - found
> ===>   virtualbox-ose-3.2.6 depends on file: /usr/local/bin/uic-qt4 - found
> ===>   virtualbox-ose-3.2.6 depends on file: /usr/local/bin/sdl-config -
> found
> ===>   virtualbox-ose-3.2.6 depends on executable: pkg-config - found
> ===>   virtualbox-ose-3.2.6 depends on shared library: png.6 - found
> ===>   virtualbox-ose-3.2.6 depends on shared library: xslt.2 - found
> ===>   virtualbox-ose-3.2.6 depends on shared library: curl.6 - found
> ===>   virtualbox-ose-3.2.6 depends on shared library: dbus-1.3 - found
> ===>   virtualbox-ose-3.2.6 depends on shared library: SDL-1.2.11 - found
> ===>   virtualbox-ose-3.2.6 depends on shared library: glib-2.0.0 - found
> ===>   virtualbox-ose-3.2.6 depends on shared library: IDL-2.0 - found
> ===>  Configuring for virtualbox-ose-3.2.6
> Checking for environment: Determined build machine: freebsd.x86, target
> machine: freebsd.x86, OK.
> Checking for kBuild: found, OK.
> Checking for gcc: found version 4.2.1, OK.
> Checking for as86: found version 0.16.17, OK.
> Checking for bcc: found version 0.16.17, OK.
> Checking for iasl: found version 20090521, OK.
> Checking for xslt: found, OK.
> Checking for pthread: found, OK.
> Checking for libxml2: found version 2.7.7, OK.
> Checking for libxslt: found version 1.1.26, OK.
> Checking for libIDL: found version 0.8.14, OK.
> Checking for ssl: found version OpenSSL 0.9.8k 25 Mar 2009, OK.
> Checking for libcurl: found version 7.20.1, OK.
> Checking for zlib: found version 1.2.3, OK.
> Checking for SDL: found version 1.2.14, OK.
> Checking for X libraries: found, OK.
> Checking for Xcursor: found, OK.
> Checking for Xinerama: found, OK.
> Checking for Xrandr: found, OK.
> Checking for Xmu: found, OK.
> Checking for Mesa / GLU:
>   Mesa not found at -L/usr/X11R6/lib -L/usr/X11R6/lib64 -L/usr/local/lib
> -lXext -lX11 -lGL -I/usr/local/include or Mesa headers not found
>   Check the file
> /usr/ports/emulators/virtualbox-ose/work/VirtualBox-3.2.6_OSE/configure.log
> for detailed error information.
> ===>  Script "configure" failed unexpectedly.
> Please report the problem to vbox at FreeBSD.org [maintainer] and attach the
> "/usr/ports/emulators/virtualbox-ose/work/VirtualBox-3.2.6_OSE/config.log"
> including the output of the failure of your make command. Also, it might be
> a good idea to provide an overview of all packages installed on your system
> (e.g. an `ls /var/db/pkg`).
> *** Error code 1
>
> Stop in /usr/ports/emulators/virtualbox-ose.
> *** Error code 1
>
> Stop in /usr/ports/emulators/virtualbox-ose.
>



thanks in advance