The ebuild for virtualbox-modules tries to call "make M=... modules" in KERNEL_DIR (typically /usr/src/linux) instead of KBUILD_OUTPUT. As a result, "no .config" error message pops up and the compile aborts. Reproducible: Always Steps to Reproduce: 1. KBUILD_OUTPUT=/path/to/kernel/build/dir 2. emerge virtualbox-modules Actual Results: * Preparing vboxdrv module make -j4 HOSTCC=x86_64-pc-linux-gnu-gcc CROSS_COMPILE=x86_64-pc-linux-gnu- LDFLAGS= KERN_DIR=/usr/src/linux KERNOUT=/usr/src/linux-build all *** Building 'vboxdrv' module *** make[1]: Entering directory `/var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv' make KBUILD_VERBOSE= SUBDIRS=/var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv SRCROOT=/var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv -C /usr/src/linux modules make[2]: Entering directory `/usr/src/linux-2.6.39-gentoo-r2' ERROR: Kernel configuration is invalid. include/generated/autoconf.h or include/config/auto.conf are missing. Run 'make oldconfig && make prepare' on kernel src to fix it. WARNING: Symbol version dump /usr/src/linux-2.6.39-gentoo-r2/Module.symvers is missing; modules will have no dependencies and modversions. CC [M] /var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv/linux/SUPDrv-linux.o CC [M] /var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv/SUPDrv.o CC [M] /var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv/SUPDrvSem.o CC [M] /var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv/r0drv/alloc-r0drv.o cc1: fatal error: include/generated/autoconf.h: No such file or directory compilation terminated. cc1: fatal error: include/generated/autoconf.h: No such file or directory compilation terminated. cc1: fatal error: include/generated/autoconf.h: No such file or directory compilation terminated. cc1: fatal error: include/generated/autoconf.h: No such file or directory compilation terminated. make[3]: *** [/var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv/SUPDrv.o] Error 1 make[3]: *** Waiting for unfinished jobs.... make[3]: *** [/var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv/linux/SUPDrv-linux.o] Error 1 make[3]: *** [/var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv/SUPDrvSem.o] Error 1 make[3]: *** [/var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv/r0drv/alloc-r0drv.o] Error 1 make[2]: *** [_module_/var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv] Error 2 make[2]: Leaving directory `/usr/src/linux-2.6.39-gentoo-r2' make[1]: *** [vboxdrv] Error 2 make[1]: Leaving directory `/var/tmp/portage/app-emulation/virtualbox-modules-4.0.10/work/vboxdrv' make: *** [all] Error 2 emake failed Expected Results: normal compile and install Changing KV_DIR to KV_OUT_DIR in the ebuild will solve the problem.
This appears to have been fixed in the meantime. I have app-emulation/virtualbox-modules-4.1.22 emerged, even though my KERNEL_DIR != my KBUILD_OUTPUT.
*** This bug has been marked as a duplicate of bug 285866 ***
