After you update webkit-gtk to 1.4.1-r200, emerge of sflphone will fail, because library(-path) webkit-1.0 will not exists anymore. ("cannot find -lwebkit-1.0
Created attachment 276915 [details]
Use new library(-path) webkitgkt-1.0 will fix the problem.
This issue exists on 0.9.12 as well and 0.9.13 is not in portage...
This is fixed in 1.0.1.