perl 解释器

				This version of sdbm merely has all the dbm_* names translated to sdbm_*
				so that we can link ndbm and sdbm into the same executable.  (It also has
				the bad() macro redefined to allow a zero-length key.)
				
				
				Fri Apr 15 10:15:30 EDT 1994.
				
				Additional portability/configuration changes for libsdbm by Andy Dougherty
				doughera@lafcol.lafayette.edu.