why Qt is disabled in cmake
-- Found unsuitable Qt version "5.0.1" from /usr/bin/qmake
-- QWT Version: 5.2.2
--
-- Python checking for PyQt4
-- Python checking for PyQt4 - found
--
-- Configuring gr-qtgui support...
-- Dependency Boost_FOUND = TRUE
-- Dependency QT4_FOUND = FALSE
-- Dependency QWT_FOUND = TRUE
-- Dependency ENABLE_VOLK = ON
-- Dependency ENABLE_GNURADIO_RUNTIME = ON
-- Dependency ENABLE_GR_FFT = ON
-- Dependency ENABLE_GR_FILTER = ON
-- Dependency PYTHONLIBS_FOUND = TRUE
-- Dependency PYQT4_FOUND = TRUE
-- Disabling gr-qtgui
support.
-- Override with -DENABLE_GR_QTGUI=ON/OFF
-- Boost version: 1.53.0
-- Found the following Boost libraries:
-- date_time
-- program_options
-- filesystem
-- system
-- thread
///////////////////////////////////////////
-- ######################################################
-- # Gnuradio disabled components
-- ######################################################
-- * sphinx
-- * gr-ctrlport
-- *
gr-comedi
-- * gr-qtgui
--