My situation seems a bit different. I bisected this and the first bad commit is:
7078f0462e899abdc619e98384a5eff39293e322 is the first bad commit
commit 7078f0462e899abdc619e98384a5eff39293e322
Author: Jeff Bezanson
Date: Fri Jun 20 18:41:37 2014 -0400
bump libuv
should fix #6523
this also brings in the change to use vfork
Unless someone has a solution, I will open an Issue.
Glen
