After a build of gnome-vfs failed during the doc making phase, I noticed that the ebuild had no knowledge of the USE flag "doc", and thus didn't allow the user to not build the docs. I will attach a simple patch which adds this. The patch has tested successfully for me.
Created attachment 28401 [details, diff] patch to add knowledge of USE flag "doc"
The `doc' flag is now implemented here. Thank you.