Hi, I just backported the fixes from sage-core-4.4.1 in src_prepare() to sage-core-4.3.5 and noticed now the same failures on amd64 as reported by Steven with sage-4.4 - so I have done something wrong in src_prepare(). I dont see the reason right now and will investigate on that later - maybe some of you see it.
Christopher PS: Commited from PC with wrong time - dont be confused when looking at the history. I hope this doesnt break git
