objc_mutex_t

[Julien Isorce]

Hi,
I need to use objc_mutex_t. (so I have to include objc/thr.h)

Using default gcc (i686-apple-darwin9-gcc-4.0.1) that comes with Leopard,
there is no thr.h  in /usr/include/objc

Do I need to install gcc from macports or is there any other way to have
this thr.h ?

Sincerely

Julien
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