virtualbox compilation error under Mac OSX Lion

[frederic.leger@…]

Under MAC 10.8.2, latest macport release, I try to install virtualbox @4.2.6, but error occurs during compilation kmk :

:info:build /opt/local/bin/ranlib: file: /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_emulators_virtualbox/virtualbox/work/VirtualBox-4.2.6/out/darwin.amd64/release/obj/RuntimeR3/RuntimeR3.a(timesupref.o) has no symbols
:info:build kmk_builtin_append '/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_emulators_virtualbox/virtualbox/work/VirtualBox-4.2.6/out/darwin.amd64/release/obj/RuntimeR3/RuntimeR3.a.dep' 'define RuntimeR3_CMDS_PREV_'
:info:build kmk_builtin_append -c '/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_emulators_virtualbox/virtualbox/work/VirtualBox-4.2.6/out/darwin.amd64/release/obj/RuntimeR3/RuntimeR3.a.dep' '/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_emulators_virtualbox/virtualbox/work/VirtualBox-4.2.6/out/darwin.amd64/release/obj/RuntimeR3/RuntimeR3.a'
:info:build kmk_builtin_append '/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_emulators_virtualbox/virtualbox/work/VirtualBox-4.2.6/out/darwin.amd64/release/obj/RuntimeR3/RuntimeR3.a.dep' 'endef'
:info:build kmk: *** Exiting with status 2
:info:build Command failed:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_emulators_virtualbox/virtualbox/work/VirtualBox-4.2.6" && . env.sh && kmk all KBUILD_VERBOSE=full 
:info:build Exit code: 2
:error:build org.macports.build for port virtualbox returned: command execution failed
:debug:build Error code: CHILDSTATUS 35263 2
:debug:build Backtrace: command execution failed
    while executing
"system -nice 0 $fullcmdstring"
    ("eval" body line 1)
    invoked from within
"eval system $notty $nice \$fullcmdstring"
    invoked from within
"command_exec build"
    (procedure "portbuild::build_main" line 8)
    invoked from within
"$procedure $targetname"
:info:build Warning: targets not executed for virtualbox: org.macports.activate org.macports.build org.macports.destroot org.macports.install