[Ros-release] Pre-release build failed, release build did no…

All,

I ran into some strange behavior recently. I tried to do a pre-release
build recently on my abb stack. I had done one about 2 months ago, but
forgot to do a release (I'm losing it). Despite not making any changes,
the pre-release build failed. I tried several "fixes" but nothing seemed
to work. I compared the abb stack to the motoman stack (already released).
Even though both had nearly the same dependencies, abb wouldn't build. By
that point I had convinced myself that something was wrong with the
pre-release. I went ahead and released abb, which surprisingly built with
no problems. The links for the releases can be found below. Has anybody
else encountered this problem? What am I missing?

ABB Pre-release (precise) :
http://build.willowgarage.com//job/prerelease_groovy_abb_precise_amd64/15/

ABB release (precise):
http://build.willowgarage.com//job/prerelease_groovy_abb_precise_amd64/16/