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添加后报以下的错误
'libxml/tree.h' file not found
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${SDK_ROOT}/usr/include/libxml2

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解决以后出现20个错误

'release' is unavailable: not available in automatic reference counting mode
ARC forbids explicit message send of 'release'
'autorelease' is unavailable: not available in automatic reference counting mode
ARC forbids explicit message send of 'autorelease'
'retain' is unavailable: not available in automatic reference counting mode
ARC forbids explicit message send of 'retain'

'release' is unavailable:

-fno-objc-arc

1.在targets->build phases中修改compiler Flags属性，添加：-fobjc-arc，就可以让旧的工程支持arc；
2.在targets->build phases中修改compiler Flags属性，添加：-fno-objc-arc，就可以让支持arc的工程不使用arc

-fno-objc-arc