Problems building virtualbox on FreeBSD 9.1-Release

[Roger Batriu]

Hello,

when i try to build the virtualbox-ose port it ends with the following
error:

cd
/usr/ports/emulators/virtualbox-ose-kmod/work/VirtualBox-4.2.18/out/freebsd.amd64/release/bin/src
&& make SYSDIR=/usr/src/sys
*** Building 'vboxdrv' module ***
"/usr/src/sys/conf/kmod.mk", line 76: Could not find bsd.compiler.mk
"/usr/src/sys/conf/kmod.mk", line 112: Malformed conditional
(${COMPILER_TYPE} != "clang")
"/usr/src/sys/conf/kmod.mk", line 116: if-less endif
"/usr/src/sys/conf/kern.mk", line 18: Malformed conditional
(${COMPILER_TYPE} == "clang")
"/usr/src/sys/conf/kern.mk", line 33: if-less endif
"/usr/src/sys/conf/kern.mk", line 103: Malformed conditional
(${COMPILER_TYPE} == "clang")
"/usr/src/sys/conf/kern.mk", line 109: if-less endif
make: fatal errors encountered -- cannot continue
*** [all] Error code 1

Stop in
/usr/ports/emulators/virtualbox-ose-kmod/work/VirtualBox-4.2.18/out/freebsd.amd64/release/bin/src.
*** [do-build] Error code 1

Stop in /usr/ports/emulators/virtualbox-ose-kmod.
*** [install] Error code 1

Stop in /usr/ports/emulators/virtualbox-ose-kmod.
*** [run-depends] Error code 1

Stop in /usr/ports/emulators/virtualbox-ose.
*** [install] Error code 1

Stop in /usr/ports/emulators/virtualbox-ose.

I upgraded ports and usr/src before the build atempr.
What can I do?

Thanks!