/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c: In function ‘vbox_bo_move’:
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:207:29: error: incompatible type for argument 2 of ‘ttm_bo_move_memcpy’
  r = ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu, new_mem);
                             ^~~~~~~~~~~~~
In file included from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_drv.h:65:0,
                 from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:30:
./include/drm/ttm/ttm_bo_driver.h:1001:5: note: expected ‘struct ttm_operation_ctx *’ but argument is of type ‘bool {aka _Bool}’
 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
     ^~~~~~~~~~~~~~~~~~
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:207:44: error: incompatible type for argument 3 of ‘ttm_bo_move_memcpy’
  r = ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu, new_mem);
                                            ^~~~~~~~~~~
In file included from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_drv.h:65:0,
                 from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:30:
./include/drm/ttm/ttm_bo_driver.h:1001:5: note: expected ‘struct ttm_mem_reg *’ but argument is of type ‘bool {aka _Bool}’
 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
     ^~~~~~~~~~~~~~~~~~
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:207:6: error: too many arguments to function ‘ttm_bo_move_memcpy’
  r = ttm_bo_move_memcpy(bo, interruptible, no_wait_gpu, new_mem);
      ^~~~~~~~~~~~~~~~~~
In file included from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_drv.h:65:0,
                 from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:30:
./include/drm/ttm/ttm_bo_driver.h:1001:5: note: declared here
 int ttm_bo_move_memcpy(struct ttm_buffer_object *bo,
     ^~~~~~~~~~~~~~~~~~
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c: In function ‘vbox_ttm_tt_populate’:
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:244:9: error: too few arguments to function ‘ttm_pool_populate’
  return ttm_pool_populate(ttm);
         ^~~~~~~~~~~~~~~~~
In file included from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:31:0:
include/drm/ttm/ttm_page_alloc.h:50:5: note: declared here
 int ttm_pool_populate(struct ttm_tt *ttm, struct ttm_operation_ctx *ctx);
     ^~~~~~~~~~~~~~~~~
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c: At top level:
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:254:21: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
  .ttm_tt_populate = vbox_ttm_tt_populate,
                     ^~~~~~~~~~~~~~~~~~~~
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:254:21: note: (near initialization for ‘vbox_bo_driver.ttm_tt_populate’)
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:261:10: error: initialization from incompatible pointer type [-Werror=incompatible-pointer-types]
  .move = vbox_bo_move,
          ^~~~~~~~~~~~
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:261:10: note: (near initialization for ‘vbox_bo_driver.move’)
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:266:16: error: ‘ttm_bo_default_io_mem_pfn’ undeclared here (not in a function)
  .io_mem_pfn = ttm_bo_default_io_mem_pfn,
                ^~~~~~~~~~~~~~~~~~~~~~~~~
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c: In function ‘vbox_bo_pin’:
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:435:8: error: too many arguments to function ‘ttm_bo_validate’
  ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
        ^~~~~~~~~~~~~~~
In file included from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_drv.h:64:0,
                 from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:30:
./include/drm/ttm/ttm_bo_api.h:338:5: note: declared here
 int ttm_bo_validate(struct ttm_buffer_object *bo,
     ^~~~~~~~~~~~~~~
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c: In function ‘vbox_bo_unpin’:
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:462:8: error: too many arguments to function ‘ttm_bo_validate’
  ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
        ^~~~~~~~~~~~~~~
In file included from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_drv.h:64:0,
                 from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:30:
./include/drm/ttm/ttm_bo_api.h:338:5: note: declared here
 int ttm_bo_validate(struct ttm_buffer_object *bo,
     ^~~~~~~~~~~~~~~
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c: In function ‘vbox_bo_push_sysram’:
/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:494:8: error: too many arguments to function ‘ttm_bo_validate’
  ret = ttm_bo_validate(&bo->bo, &bo->placement, false, false);
        ^~~~~~~~~~~~~~~
In file included from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_drv.h:64:0,
                 from /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.c:30:
./include/drm/ttm/ttm_bo_api.h:338:5: note: declared here
 int ttm_bo_validate(struct ttm_buffer_object *bo,
     ^~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:324: /var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/vbox_ttm.o] Error 1
make[2]: *** Waiting for unfinished jobs....
   ./tools/objtool/objtool orc generate  --module --no-fp  "/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/.tmp_vbva_base.o";
   ./tools/objtool/objtool orc generate  --module --no-fp  "/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/.tmp_vbox_mode.o";
   ./tools/objtool/objtool orc generate  --module --no-fp  "/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/.tmp_vbox_prime.o";
make[1]: *** [Makefile:1561: _module_/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo] Error 2
make[1]: Leaving directory '/usr/src/linux-4.16.0-gentoo'
make: *** [/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo/Makefile.include.footer:101: vboxvideo] Error 2
 * ERROR: app-emulation/virtualbox-guest-additions-5.2.8::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=app-emulation/virtualbox-guest-additions-5.2.8::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=app-emulation/virtualbox-guest-additions-5.2.8::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/temp/environment'.
 * Working directory: '/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo'
 * S: '/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/VirtualBox-5.2.8'

>>> Failed to emerge app-emulation/virtualbox-guest-additions-5.2.8, Log file:

>>>  '/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/temp/build.log'

 * Messages for package app-emulation/virtualbox-guest-additions-5.2.8:

 * ERROR: app-emulation/virtualbox-guest-additions-5.2.8::gentoo failed (compile phase):
 *   emake failed
 * 
 * If you need support, post the output of `emerge --info '=app-emulation/virtualbox-guest-additions-5.2.8::gentoo'`,
 * the complete build log and the output of `emerge -pqv '=app-emulation/virtualbox-guest-additions-5.2.8::gentoo'`.
 * The complete build log is located at '/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/temp/build.log'.
 * The ebuild environment file is located at '/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/temp/environment'.
 * Working directory: '/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/vboxvideo'
 * S: '/var/tmp/portage/app-emulation/virtualbox-guest-additions-5.2.8/work/VirtualBox-5.2.8'