require 'mkmf'
dir_config("dbm")
have_library("gdbm", "dbm_open") or
  have_library("db", "dbm_open") or
  have_library("dbm", "dbm_open")
have_header("cdefs.h") 
if have_header("ndbm.h") and have_func("dbm_open")
  have_func("dbm_clearerr")
  create_makefile("dbm")
end