http://download1.rpmfusion.org/free/fedora/development/21/source/SRPMS/VirtualBox-4.3.18-1.fc21.src.rpm
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/mingpj2/vritualbox-4.3.18/
http://download1.rpmfusion.org/free/fedora/development/21/source/SRPMS/VirtualBox-4.3.18-1.fc21.src.rpm