hotot build error

gistfile1.sh

lb@lbsmall:~/dev$ mkdir hototbuild
lb@lbsmall:~/dev$ cd hototbuild/
lb@lbsmall:~/dev/hototbuild$ cmake ../Hotot/
-- The C compiler identification is GNU
-- The CXX compiler identification is GNU
-- Check for working C compiler: /usr/bin/gcc
-- Check for working C compiler: /usr/bin/gcc -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++
-- Check for working CXX compiler: /usr/bin/c++ -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- KDE4 not found, disabling KDE integration
-- Looking for Q_WS_X11
-- Looking for Q_WS_X11 - found
-- Looking for Q_WS_WIN
-- Looking for Q_WS_WIN - not found.
-- Looking for Q_WS_QWS
-- Looking for Q_WS_QWS - not found.
-- Looking for Q_WS_MAC
-- Looking for Q_WS_MAC - not found.
-- Found Qt4: /usr/bin/qmake (found suitable version "4.7.4", required is "4.7")
-- Configuring done
-- Generating done
-- Build files have been written to: /home/lb/dev/hototbuild
lb@lbsmall:~/dev/hototbuild$ make
[  5%] Generating moc_hototwebview.cxx
[ 10%] Generating moc_mainwindow.cxx
[ 15%] Generating moc_formpost.cxx
[ 20%] Generating moc_hototrequest.cxx
[ 25%] Generating moc_hototwebpage.cxx
[ 30%] Generating moc_qttraybackend.cxx
Scanning dependencies of target hotot-qt
[ 35%] Building CXX object qt/src/CMakeFiles/hotot-qt.dir/formpost.cpp.o
[ 40%] Building CXX object qt/src/CMakeFiles/hotot-qt.dir/hototrequest.cpp.o
[ 45%] Building CXX object qt/src/CMakeFiles/hotot-qt.dir/main.cpp.o
[ 50%] Building CXX object qt/src/CMakeFiles/hotot-qt.dir/mainwindow.cpp.o
[ 55%] Building CXX object qt/src/CMakeFiles/hotot-qt.dir/hototwebpage.cpp.o
[ 60%] Building CXX object qt/src/CMakeFiles/hotot-qt.dir/qttraybackend.cpp.o
[ 65%] Building CXX object qt/src/CMakeFiles/hotot-qt.dir/hototwebview.cpp.o
/home/lb/dev/Hotot/qt/src/hototwebview.cpp: In Elementfunktion »virtual void HototWebView::dropEvent(QDropEvent*)«:
/home/lb/dev/Hotot/qt/src/hototwebview.cpp:71:17: Fehler: »class QUrl« hat kein Element namens »isLocalFile«
make[2]: *** [qt/src/CMakeFiles/hotot-qt.dir/hototwebview.cpp.o] Fehler 1
make[1]: *** [qt/src/CMakeFiles/hotot-qt.dir/all] Fehler 2
make: *** [all] Fehler 2

the error message in german means something like
"Error: >>class QUrl<< doesn't have an element named >>isLocalFile<<"