I am trying to install ROS Hydro from source on Ubuntu 12.04 32 bit. I am not able to compile qtguicpp and I got this problem:

ros_catkin_ws/src/qt_gui_core/qt_gui_cpp/include/qt_gui_cpp/plugin_descriptor.h:36:16: fatal error: QMap: No such file or directory compilation terminated.

I have installed qt4 and if I locate QMap I have:

/usr/include/qt4/QtCore/QMap

So, it should be ok. How I can solve this problem?