Is R-devel broken?

Hi,

I'm building r-devel using [1], and I see:

mv: './grid/vignettes/grid.Rnw-lattice' and
'./grid/vignettes/grid.Rnw' are the same file
make[1]: *** [Makefile:121: vignettes-no-lattice] Error 1

Regards,
I?aki

[1] https://hub.docker.com/r/rocker/r-devel/dockerfile