Can't link libdispatch in C language

[RainyLave]

when i use cmake to link libdispatch with my project written in C, I got API_AVAILABLE(macos(10.7), ios(5.0))
DISPATCH_EXPORT DISPATCH_PURE DISPATCH_NONNULL1 DISPATCH_NOTHROW
is not defined.
and there's still a lot of errors in data.h queue.h dipatch.h .etc
if I wants to use libdispatch, should I change these .h files to compate with C project? Is there any better solution to reduce the work when linking the lib with C project?