ERROR:./../folly/portability/Malloc.h:27:12:error:unknowntypename'size_t'

 shell

In file included from portability/Malloc.cpp:17:

./../folly/portability/Malloc.h:27:12: error: unknown type name &＃039;size_t&＃039;

extern "C" size_t malloc_usable_size(void* ptr);

           ^

1 error generated.

make[4]: *** [portability/Malloc.lo] Error 1

make[3]: *** [all-recursive] Error 1

make[2]: *** [all] Error 2

make[1]: *** [all-recursive] Error 1

make: *** [all] Error 2

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