bitcoin/bitcoin — pull request #3769 by haakonn (2014-02-28 19:55:59+00:00)
Title: Build doc fix for debian/ubuntu+qt5

Trying to build master on latest Ubuntu against qt5 while following build-unix.md, configure could not find qt5. This resolved itself when I installed qttools5-dev, which contains qt5 headers and a few build-related tools. So this seems like an omission, and here's the world's smallest pull request to fix it.