qtbase/configure not found. Did you forget to run "init-repository"?

You probably did the same thing I did. Hit the "Download" button to download Qt5 source.

# ./configure -developer-build -opensource
/.../qt5/qtbase/configure not found. Did you forget to run "init-repository"?
# init-repository
-bash: init-repository: command not found
# ls qtbase
total 0

Solution: use git to pull Qt5 so you'll have init-repository

# git clone git://gitorious.org/qt/qt5.git qt5
# init-repository
# ./configure -developer-build -opensource