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I'd like to import runtime's header to use objc_msgSend but I'm getting:
error: NSObjCRuntime.h: No such file or directory Should I add something to the header search path?
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You'll need to include <objc/message.h> (you'll find the related headers in /usr/include/objc) and link to the objc (/usr/lib/libobjc.dylib) library.
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