The change from sci-libs/gsl-1.9 to sci-libs/gsl-1.9-r1 introduced a dependency on app-admin/eselect-cblas which isn't in the tree yet.
app-admin/eselect-cblas is in portage now, this should be closed.
ohw, ok, thanks!
Where can I find it in the prefix tree? The current sci-libs/gsl-1.10 still requires the missing app-admin/eselect-cblas.
I was fooled by a non-prefix user
I added it to the tree.