Mine

linux-43b4:/usr/src/linux # more /var/log/vbox-install.log
Makefile:175: Warning: using /usr/src/linux as the source directory of your Linux kernel. If this is not correct, specify KERN_DIR=<directory> and run Make again.                  
make KBUILD_VERBOSE=1 SUBDIRS=/tmp/vbox.0 SRCROOT=/tmp/vbox.0 CONFIG_MODULE_SIG= -C /usr/src/linux modules                                                                          
test -e include/generated/autoconf.h -a -e include/config/auto.conf || (                \                                                                                           
echo;                                                           \                                                                                                                   
echo "  ERROR: Kernel configuration is invalid.";               \                                                                                                                   
echo "         include/generated/autoconf.h or include/config/auto.conf are missing.";\                                                                                             
echo "         Run 'make oldconfig && make prepare' on kernel src to fix it.";  \                                                                                                   
echo;                                                           \                                                                                                                   
/bin/false)                                                                                                                                                                         
mkdir -p /tmp/vbox.0/.tmp_versions ; rm -f /tmp/vbox.0/.tmp_versions/*                                                                                                              
                                                                                                                                                                                    
  WARNING: Symbol version dump /usr/src/linux-3.1.0-1.2/Module.symvers
           is missing; modules will have no dependencies and modversions.

make -f scripts/Makefile.build obj=/tmp/vbox.0
  gcc -Wp,-MD,/tmp/vbox.0/linux/.SUPDrv-linux.o.d  -nostdinc -isystem /usr/lib64/gcc/x86_64-suse-linux/4.6/include -I/usr/src/linux-3.1.0-1.2/arch/x86/include -Iarch/x86/include/ge
nerated -Iinclude  -include /usr/src/linux-3.1.0-1.2/include/linux/kconfig.h -D__KERNEL__ -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs -fno-strict-aliasing -fno-common -Werror-
implicit-function-declaration -Wno-format-security -fno-delete-null-pointer-checks -O2 -m64 -mtune=generic -mno-red-zone -mcmodel=kernel -funit-at-a-time -maccumulate-outgoing-args
 -DCONFIG_AS_CFI=1 -DCONFIG_AS_CFI_SIGNAL_FRAME=1 -DCONFIG_AS_CFI_SECTIONS=1 -DCONFIG_AS_FXSAVEQ=1 -pipe -Wno-sign-compare -mno-sse -mno-mmx -mno-sse2 -mno-3dnow -Wframe-larger-tha
n=2048 -fno-stack-protector -Wno-unused-but-set-variable -fomit-frame-pointer -fasynchronous-unwind-tables -g -fno-inline-functions-called-once -Wdeclaration-after-statement -Wno-p
ointer-sign -fno-strict-overflow -fconserve-stack -DCC_HAVE_ASM_GOTO -include /tmp/vbox.0/include/VBox/SUPDrvMangling.h -I/usr/src/linux/include -I/tmp/vbox.0/ -I/tmp/vbox.0/includ
e -I/tmp/vbox.0/r0drv/linux -I/tmp/vbox.0/vboxdrv/ -I/tmp/vbox.0/vboxdrv/include -I/tmp/vbox.0/vboxdrv/r0drv/linux -D__KERNEL__ -DMODULE -DRT_OS_LINUX -DIN_RING0 -DIN_RT_R0 -DIN_SU
P_R0 -DVBOX -DRT_WITH_VBOX -DVBOX_WITH_HARDENING -DCONFIG_VBOXDRV_AS_MISC -DRT_ARCH_AMD64 -DVBOX_WITH_64_BITS_GUESTS  -DMODULE  -D"KBUILD_STR(s)=#s" -D"KBUILD_BASENAME=KBUILD_STR(S
UPDrv_linux)"  -D"KBUILD_MODNAME=KBUILD_STR(vboxdrv)" -c -o /tmp/vbox.0/linux/.tmp_SUPDrv-linux.o /tmp/vbox.0/linux/SUPDrv-linux.c
/bin/sh: scripts/genksyms/genksyms: Datei oder Verzeichnis nicht gefunden
make[2]: *** [/tmp/vbox.0/linux/SUPDrv-linux.o] Fehler 1
make[1]: *** [_module_/tmp/vbox.0] Error 2
make: *** [vboxdrv] Error 2