c++ - Qt5 undefined reference to `QDeclarativeDebuggingEnabler::QDeclarativeDebuggingEnabler()' -

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suddenly had problem... 

classitem.o: in function `__static_initialization_and_destruction_0': /../../qt/5.4/gcc_64/include/qtdeclarative/qdeclarativedebug.h:50: undefined reference `qdeclarativedebuggingenabler::qdeclarativedebuggingenabler()' collect2: error: ld returned 1 exit status make: *** [medjournal] error 1 09:29:05: process "/usr/bin/make" exited code 2.

went far stripping qobject class object, still got same error.

it turns out reason line causing trouble:

#include <qtdeclarative/qdeclarativeview>

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