It was the .pri file. Thanks for the tip on where to look, I fixed it and pushed the patch.

Interestingly enough, I found this: http://stackoverflow.com/questions/1967646/using-pri-files-in-qt where the last poster refers to Qt documentation that says the .pro files should only be used for Unix and Mac specific settings. This document implies a little differently: http://qt-project.org/wiki/IncludingProFiles. Not really an issue, just an FYI.