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/usr/share/qt4/mkspecs/features/dbusinterfaces.prf is in qt4-qmake 4:4.8.1-0ubuntu4.

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load(moc)

qtPrepareTool(QMAKE_QDBUSXML2CPP, qdbusxml2cpp)

for(DBUS_INTERFACE, $$list($$unique(DBUS_INTERFACES))) {

    !contains(DBUS_INTERFACE, .*\\w\\.xml$) {
        warning("Invalid D-BUS interface : '$${DBUS_INTERFACE}', please use 'com.mydomain.myinterface.xml' instead.")
        next()
    }

    DBUS_INTERFACE_LIST += $${DBUS_INTERFACE}
}

dbus_interface_header.commands = $$QMAKE_QDBUSXML2CPP -p ${QMAKE_FILE_OUT}: ${QMAKE_FILE_IN}
dbus_interface_header.output_function = dbus_interface_header_output
dbus_interface_header.name = DBUSXML2CPP INTERFACE HEADER ${QMAKE_FILE_IN}
dbus_interface_header.variable_out = DBUS_INTERFACE_HEADERS
dbus_interface_header.input = DBUS_INTERFACE_LIST

defineReplace(dbus_interface_header_output) {
    return("$$lower($$section($$list($$basename(1)),.,-2,-2))_interface.h")
}

dbus_interface_source.commands = $$QMAKE_QDBUSXML2CPP -i ${QMAKE_FILE_OUT_BASE}.h -p :${QMAKE_FILE_OUT} ${QMAKE_FILE_IN}
dbus_interface_source.output_function = dbus_interface_source_output
dbus_interface_source.name = DBUSXML2CPP INTERFACE SOURCE ${QMAKE_FILE_IN}
dbus_interface_source.variable_out = SOURCES
dbus_interface_source.input = DBUS_INTERFACE_LIST

dbus_interface_moc.commands = $$moc_header.commands
dbus_interface_moc.output = $$moc_header.output
dbus_interface_moc.depends = $$dbus_interface_header.output
dbus_interface_moc.input = DBUS_INTERFACE_HEADERS
dbus_interface_moc.variable_out = GENERATED_SOURCES
dbus_interface_moc.name = $$moc_header.name

defineReplace(dbus_interface_source_output) {
    return("$$lower($$section($$list($$basename(1)),.,-2,-2))_interface.cpp")
}

QMAKE_EXTRA_COMPILERS += dbus_interface_header dbus_interface_source dbus_interface_moc