With the inclusion of the new split tcl/tk ebuilds, the vim ebuilds need to be updated to use them.
Adding a block to master project bug 101
The Vim ebuild doesn't currently support tcl/tk due to bugs in the interaction between vim and the tcl interpreter. If you look in the ebuild you can seem my comments regarding this. Please don't enable tcl/tk without verifying that the test mentioned in the comment executes successfully.
Vim doesn't presently use tcl/tk, and besides it has already been updated. This bug no longer makes any sense, so I'm closing it.
I've submitted a patch for this in bug #26. Can't seem to unset the leave-as-resolved flag in netscape :(