!isEmpty(MODULE_PRI) {
    pritarget.path = $$[QT_INSTALL_DATA]/mkspecs/modules
    pritarget.files = $$MODULE_PRI
    INSTALLS = pritarget
} else {
    warning("Project $$basename(_PRO_FILE_) is a module, but has not defined MODULE_PRI, which is required for Qt to expose the module to other projects")
}