[SOLVED] build with Qt on MacOs

Hi,
I recently got into trouble compiling sofa (master branch) on MacOS:

In file included from /Users/ffaure/scm/SOFA/sofa-build-debug/SofaGui/SofaGuiQt/moc_AddObject.cpp:9:
In file included from /Users/ffaure/scm/SOFA/sofa-build-debug/SofaGui/SofaGuiQt/../../../sofa/applications/sofa/gui/qt/AddObject.h:29:
In file included from /Users/ffaure/scm/SOFA/sofa-build-debug/SofaGui/SofaGuiQt/ui_DialogAddObject.h:13:
In file included from /Library/Qt5/5.4/clang_64/lib/QtWidgets.framework/Headers/QAction:1:
In file included from /Library/Qt5/5.4/clang_64/lib/QtWidgets.framework/Headers/qaction.h:39:
In file included from /Library/Qt5/5.4/clang_64/lib/QtWidgets.framework/Headers/qwidget.h:45:
/Library/Qt5/5.4/clang_64/lib/QtWidgets.framework/Headers/qsizepolicy.h:44:24: error: variable has incomplete type 'class Q_WIDGETS_EXPORT'
class Q_WIDGETS_EXPORT QSizePolicy

and a bunch of similar errors. This was due to some mix of Qt4 and Qt5. Here is how to fix this:

1. Uninstall Qt4: sudo port uninstall qt4-mac
   Unfortunately, this will also uninstall cmake-gui. I am now using ccmake in a terminal.
2. Install Qt5. I downloaded and installed 5.5 from the web site. Notice that you can not move the directory once it is installed. I installed it in /Library/Qt.
3. Configure the build of Sofa using cmake and ccmake. The Qt5_dir variable must contain a path to the directory containing file Qt5Config.cmake. In my case the path is /Library/Qt/5.5/clang_64/lib/cmake/Qt5
4. Build and enjoy !