Undefined reference in qqmldebugconnector

At the end a compilation of qt declarative fails with

— sub-qmllint-make_first —
--- ../../bin/qmllint —
clang++ -pthread -o ../../bin/qmllint .obj/main.o -L/usr/local/lib -L/users/dev/proj/ext/qt5/qtdeclarative/lib -lQt5QmlDevTools -L/users/dev/proj/ext/qt5/qtbase/lib -lQt5Core -lexecinfo -lz -licui18n -licuuc -licudata -lqtpcre -lm -lutil
— sub-qml-make_first —
/users/dev/proj/ext/qt5/qtdeclarative/lib/libQt5Qml.a(qqmldebugconnector.o): In function `global constructors keyed to a':
debugger/qqmldebugconnector.cpp.text+0xfc5): undefined reference to `qt_static_plugin_QQmlInspectorServiceFactory()'
clang++: error: linker command failed with exit code 1 (use -v to see invocation)

• • • [../../bin/qml] Error code 1

make[2]: stopped in /users/dev/proj/ext/qt5/qtdeclarative/tools/qml
1 error