Summary pretty much describes it, URL is the master bug related to this issue. Specifically tested against 0.1.13-r1, earlier versions should be affected, and I'd bet 0.1.15 is also. Patch forthcoming...
Created attachment 24265 [details, diff] patch to fix compilation issues Should be all that's needed.
vkeybd-0.1.15 has no problems with compiling against 1.0.x :)
Then either use the patch for 0.1.13, or unmask to vkeydb-0.1.15 :)
Commited to cvs an updated ebuild w/ the patch, and close bug #23468 while I was at.