juffed build error

/home/chris/builds/juffed-qt5-git/src/juffed/src/3rd_party/qtsingleapplication/qtlocalpeer.cpp: In member function ‘bool QtLocalPeer::sendMessage(const QString&, int)’:
/home/chris/builds/juffed-qt5-git/src/juffed/src/3rd_party/qtsingleapplication/qtlocalpeer.cpp:164:19: error: variable ‘QDataStream ds’ has initializer but incomplete type
     QDataStream ds(&socket);
                   ^
/home/chris/builds/juffed-qt5-git/src/juffed/src/3rd_party/qtsingleapplication/qtlocalpeer.cpp: In member function ‘void QtLocalPeer::receiveConnection()’:
/home/chris/builds/juffed-qt5-git/src/juffed/src/3rd_party/qtsingleapplication/qtlocalpeer.cpp:181:26: error: variable ‘QDataStream ds’ has initializer but incomplete type
     QDataStream ds(socket);
                          ^
CMakeFiles/juffed.dir/build.make:679: recipe for target 'CMakeFiles/juffed.dir/src/3rd_party/qtsingleapplication/qtlocalpeer.cpp.o' failed
make[2]: *** [CMakeFiles/juffed.dir/src/3rd_party/qtsingleapplication/qtlocalpeer.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
CMakeFiles/Makefile2:159: recipe for target 'CMakeFiles/juffed.dir/all' failed
make[1]: *** [CMakeFiles/juffed.dir/all] Error 2
Makefile:136: recipe for target 'all' failed
make: *** [all] Error 2
==> ERROR: A failure occurred in build().
    Aborting...