app-text/scrollkeeper-dtd-1.0-r1 is being stabilized in bug 642308, and it's already stable for some/most arches. Newest stable scrollkeeper, though has: DEPEND="=app-text/scrollkeeper-dtd-1.0" I don't know relation between the two, but for better user experience it would be good to keep them in sync (by changing dependency to -r1, to -1.0* or making a revbump, for example).
This was already fixed in 1b5f3da575d46a7c21cc6ede4772956b7d35eb3e