Hi Dan,
No, there was no change required. When postBuild.sh is executed it gives an error as vmLinuz was not found, this is due to error in postBuild.sh script. Edison image built is of type bzImage and not vmLinuz. So please ignore the postBuild.sh script error and flash the image it should work.
If you are getting some other error please post what error are you seeing.
Thanks,
Vinay