hi,

FYI, if you use mk/hg_checkout.mk to pull in 3rdparty code from a
Mercurial repo, then you should know that the patch behavior will
change in ROS Electric.  Patches are now applied with `-p1` instead of
`-p0`, so that diffs generated by `hg diff` can be used directly,
without stripping the leading directory name.  You will likely have to
regenerate or otherwise modify your existing patches against Mercurial
repos.

https://code.ros.org/trac/ros/ticket/3525#comment:2

	brian.