-patch the following file 

/data/pkgsrc/databases/db4/work/db-4.8.30/os_qnx/os_qnx_open.c
+#include <fcntl.h>
+#include <sys/mman.h>

#include "db_config.h"


-patch the following file 
/data/pkgsrc/databases/db4/work/db-4.8.30/os/os_fsync.c

#elif defined(HAVE_QNX)
          +      ret = __os_fsync(fhp);


-patch the following file 
/data/pkgsrc/databases/db4/work/db-4.8.30/os/os_unlink.c 

#include <sys/mman.h>   /ADD THIS FOR QNX shm_unlink */