This package is a few minor updates behind: upstream is up to 0.3.9 now (https://rubygems.org/gems/childprocess). If this isn't blocking on anything, any chance of getting an update?
This bug appears to have been reported against 'rawhide' during the Fedora 20 development cycle. Changing version to '20'. More information and reason for this action is here: https://fedoraproject.org/wiki/BugZappers/HouseKeeping/Fedora20
Updated to 0.3.9 in rawhide / f20