VB-modules 1.4.0 doesn't compile successful on gentoo

[.matthias]

>>> Emerging (1 of 8) app-emulation/virtualbox-modules-1.4.0 to /
 * vbox-kernel-module-src-1.4.0.tar.gz RMD160 ;-) ...                     [ ok ]
 * vbox-kernel-module-src-1.4.0.tar.gz SHA1 ;-) ...                       [ ok ]
 * vbox-kernel-module-src-1.4.0.tar.gz SHA256 ;-) ...                     [ ok ]
 * vbox-kernel-module-src-1.4.0.tar.gz size ;-) ...                       [ ok ]
 * checking ebuild checksums ;-) ...                                      [ ok ]
 * checking auxfile checksums ;-) ...                                     [ ok ]
 * checking miscfile checksums ;-) ...                                    [ ok ]
 * checking vbox-kernel-module-src-1.4.0.tar.gz ;-) ...                   [ ok ]
 * Determining the location of the kernel source code
 * Found kernel source directory:
 *     /usr/src/linux
 * Found sources for kernel version:
 *     2.6.20-gentoo-r8
>>> Unpacking source...
>>> Unpacking vbox-kernel-module-src-1.4.0.tar.gz to /var/tmp/portage/app-emulation/virtualbox-modules-1.4.0/work
>>> Source unpacked.
>>> Compiling source in /var/tmp/portage/app-emulation/virtualbox-modules-1.4.0/work/vboxdrv ...
 * Preparing vboxdrv module
Makefile:97: *** Unable to find the folder to install the support driver to.  Stop.

!!! ERROR: app-emulation/virtualbox-modules-1.4.0 failed.
Call stack:
  ebuild.sh, line 1621:   Called dyn_compile
  ebuild.sh, line 973:   Called qa_call 'src_compile'
  ebuild.sh, line 44:   Called src_compile
  ebuild.sh, line 1311:   Called linux-mod_src_compile
  linux-mod.eclass, line 516:   Called die

!!! Unable to make  KERN_DIR=/usr/src/linux KERNOUT=/usr/src/linux all.
!!! If you need support, post the topmost build error, and the call stack if relevant.
!!! A complete build log is located at '/var/tmp/portage/app-emulation/virtualbox-modules-1.4.0/temp/build.log'.

On gentoo-2007.0 with gcc-4.1.2, glibc-2.5-r3 and 2.6.20-gentoo-r8.

[Frank Mehnert]

We don't maintain the kernel module for Gentoo. But i changed the Makefile slightly to not depend on the module directory if the module is only compiled but not installed. The fix will be included in the next release.