[poky] Inconsistency in calculation of virtual providers?

Hi,

I'm dealing with a product which needs a hacked-up X server using a
proprietary graphics vendor's video controller. It's easiest just to
make a separate recipe to do this, which pastes in and then modifies
as appropriate the contents of xserver-kdrive-common.inc and
xserver-kdrive_1.3.0.0.bb.

This all works fine to build, and even can be addressed directly by
the name "virtual/xserver" by bitbake commands once I've configured my
machine conf file to prefer this provider of virtual/xserver:

  $ bitbake virtual/xserver
  NOTE: Handling BitBake files: / (0761/0761) [100 %]
  NOTE: Parsing finished. 737 cached, 0 parsed, 24 skipped, 0 masked.
  NOTE: build 200708201612: started

  OE Build Configuration:
  BB_VERSION = "1.8.5"
  OE_REVISION = "<unknown>"
  TARGET_ARCH = "arm"
  TARGET_OS = "linux-gnueabi"
  MACHINE = "my-machine"
  DISTRO = "my-distro"
  DISTRO_VERSION = "0.0-snapshot-20070820"
  TARGET_FPU = "soft"

  NOTE: Resolving missing task queue dependencies
  NOTE: Preparing runqueue
  NOTE: Executing runqueue
  NOTE: Tasks Summary: Attempted 499 tasks of which 499 didn't need to
be rerun and 0 failed.
  NOTE: build 200708201612: completed

As soon as I try to use this in a task which RDEPENDS on
"virtual/xserver", though, Bitbake complains:

  $ bitbake task-blah

  ...
  ERROR: No providers of runtime build target virtual/xserver ('for
['/projects/poky.my-machine/meta/packages/tasks/task-blah.bb'])

I noticed that task-poky uses "${XSERVER}" rather than
"virtual/xserver"; are virtual things purely build-time namespaces and
not visible to the RDEPENDS clauses?

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