Qt5.1.1 と Musescore でコンパイルエラー

[LONERさん]

Qt5.1.1をインストールしてコンパイルしてみたけどエラーが出る。なぜだ・・・。
/home/kenji/Codes/MuseScore/mscore/synthcontrol.cpp: In constructor ‘Ms::SynthControl::SynthControl(QWidget*)’:
/home/kenji/Codes/MuseScore/mscore/synthcontrol.cpp:62:37: error: ‘createWindowContainer’ is not a member of ‘QWidget’
/home/kenji/Codes/MuseScore/mscore/synthcontrol.cpp:69:37: error: ‘createWindowContainer’ is not a member of ‘QWidget’
make[3]: *** [mscore/CMakeFiles/mscore.dir/synthcontrol.cpp.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[3]: Leaving directory `/home/kenji/Codes/MuseScore/build.release'
make[2]: *** [mscore/CMakeFiles/mscore.dir/all] Error 2
make[2]: Leaving directory `/home/kenji/Codes/MuseScore/build.release'
make[1]: *** [all] Error 2
make[1]: Leaving directory `/home/kenji/Codes/MuseScore/build.release'
make: *** [release] Error 2

qwidget.h に static QWidget *createWindowContainer(QWindow *window, QWidget *parent=0, Qt::WindowFlags flags=0);の記述があるんだけどな・・・