glibc/include/db.h

#ifndef _DB_H_

#ifdef USE_LIBDB1
# include <db/db.h>
#else
# include <db2/db.h>

/* Internal interface for NSS.  */
extern int __nss_db_open (const char *,
			  DBTYPE, u_int32_t, int, DB_ENV *, DB_INFO *, DB **);
#endif

#endif