It appears a couple of source files are using the offsetof macro
defined in <staddef.h>. However, those files are *not* including
<stddef.h>, which is causing intermittent compile problems. For
example, http://stackoverflow.com/q/28246642/608639.

Please add "#include <stddef.h> to the following files:

    crypto/asn1/asn1t.h
    crypto/rand/rand_egd.c

**********

In addition, rand_egd.c should probably have its own definition of
offsetof removed since its not quite right (its not using GCC
__builtin_offsetof for GCC 3.5 and above).

If the project wants to include a definition (which appears to be
unneeded), then may be something like the following should be used:

#if defined(__GNUC__) && (__GNUC__ == 3 && __GNUC_MINOR__ >= 5 || __GNUC__ > 3)
#  ifndef __offsetof
#    define __offsetof(type, field) __builtin_offsetof(type, field)
#  endif
#  define offsetof(type, field) __builtin_offsetof(type, field)
#else /* ! (gcc >= 3.5) */
#  ifndef __offsetof
#    define __offsetof(type, field) ((size_t)(&((type *)0)->field))
#  endif
#  define offsetof(type, field) ((size_t)(&((type *)0)->field))
#endif


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