NetBSD supports System V shared memory, but does anyone know why it 
doesn't support Posix shared memory, i.e.

#include <sys/mman.h>

int shm_open(const char *name, int oflag, mode_t mode);
int shm_unlink(const char *name);

I know System V and Posix shared memory implementations do more or less 
the same thing, but wouldn't it be nice to be compliant with Posix as 
much as posssible?