The homepage for media-libs/atlas-c++ is incorrect; it listed as http://www.worldforge.net/dev/eng/libraries/atlas_cpp; which is actually a typosquatter. The correct URL http://www.worldforge.org/dev/eng/libraries/atlas_cpp . (its .org; not .net) All 3 version of media-libs/atlas-c++ have the same error ".net" instead or ".org"
Fixed. Thanks for report