I got this error when trying to launch my Qt-application (which was deployed with macdeployqt) on another Mac.
dyld: Library not loaded: kqoauth.framework/Versions/0/kqoauth
Referenced from: /MyProject.app/Contents/MacOS/MyProject
Reason: image not found
otool -L was showing relative paths for both Qt and for kqoauth, my guess is they are probably all starting at root
/ and you didn't see the qt loading failing, because they're installed on your system.