In file included from mainwindow.cpp:16:
In file included from ./mainwindow.h:19:
In file included from /Applications/Qt/5.3/clang_64/lib/QtWidgets.framework/Headers/QMainWindow:1:
In file included from /Applications/Qt/5.3/clang_64/lib/QtWidgets.framework/Versions/5/Headers/qmainwindow.h:45:
In file included from /Applications/Qt/5.3/clang_64/lib/QtWidgets.framework/Headers/qwidget.h:45:
In file included from /Applications/Qt/5.3/clang_64/lib/QtGui.framework/Headers/qwindowdefs.h:45:
In file included from /Applications/Qt/5.3/clang_64/lib/QtCore.framework/Headers/qglobal.h:72:
/Applications/Qt/5.3/clang_64/lib/QtCore.framework/Headers/qsystemdetection.h:196:12: fatal error: 'TargetConditionals.h' file not found
# include <TargetConditionals.h>