[Interest] [qt-iOS] How to specify a Framework as optional?

[Liang Jian]

    Hello everyone, I want to use Photos Framework in a Qt project, so I
specify the Framework in *.pro file as below:
    LIBS += -framework Photos

    It works, but since Photos Framework was introduced in iOS 8.0, my app
won't run in iOS 7.0. Using xcode I can specify Photos Framework as
optional to address this issue. my question is: how can I specify Framework
as optional in *.pro file?
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