1 INCLUDEPATH += engines

     2 

     3 # invalid backend (nonoptional)

     4 PRIVATE_HEADERS += engines/qcontactinvalidbackend_p.h

     5 SOURCES += engines/qcontactinvalidbackend.cpp

     6 

     7 # in memory backend (also nonoptional)

     8 PRIVATE_HEADERS += engines/qcontactmemorybackend_p.h

     9 SOURCES += engines/qcontactmemorybackend.cpp

    10