doxygen

There is a Doxyfile (last touched 2011) that nothing seems to use.
There is also this in src/sox.h:

#ifndef _DOXYGEN_
lsx_static_assert(sizeof(sox_int8_t)==1,   sox_int8_size);
lsx_static_assert(sizeof(sox_uint8_t)==1,  sox_uint8_size);
lsx_static_assert(sizeof(sox_int16_t)==2,  sox_int16_size);
lsx_static_assert(sizeof(sox_uint16_t)==2, sox_uint16_size);
lsx_static_assert(sizeof(sox_int32_t)==4,  sox_int32_size);
lsx_static_assert(sizeof(sox_uint32_t)==4, sox_uint32_size);
lsx_static_assert(sizeof(sox_int64_t)==8,  sox_int64_size);
lsx_static_assert(sizeof(sox_uint64_t)==8, sox_uint64_size);
#endif

What does sizeof(int) have to do with using DOXYGEN (or not)?
Can we remove these please?

Jan