Sorry about my bad wording. Before last weekend, the AMF export was based on a version of FreeCAD master from several months ago, now it is based on a much newer version of FreeCAD master.
So, if you were to build FreeCAD from that source a few days ago, you would've had a "stale" version of FreeCAD, but with AMF export support. I rebased the changes on the latest master, so now if you build from the AMF branch, you'll get a current (well, already a little behind...) version of FreeCAD plus the AMF export.
There's an illustration of a rebase at https://gist.github.com/beckybeauchamp1 ... e6d976fcc4
that fits; except the "Master on local" should be "AMF feature branch", there are hundreds/thousands of commits between A & C, and D & E add the AMF support. -Ian-