akr	2013-05-23 22:49:10 +0900 (Thu, 23 May 2013)

  New Revision: 40901

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=40901

  Log:
    Add a comment.

  Modified files:
    trunk/ext/dbm/extconf.rb

Index: ext/dbm/extconf.rb
===================================================================
--- ext/dbm/extconf.rb	(revision 40900)
+++ ext/dbm/extconf.rb	(revision 40901)
@@ -1,3 +1,19 @@ https://github.com/ruby/ruby/blob/trunk/ext/dbm/extconf.rb#L1
+# configure option:
+#   --with-dbm-type=COMMA-SEPARATED-NDBM-TYPES
+#
+# ndbm type:
+#   libc        ndbm compatible library in libc.
+#   db          Berkeley DB (libdb)
+#   db2         Berkeley DB (libdb2)
+#   db1         Berkeley DB (libdb1)
+#   db5         Berkeley DB (libdb5)
+#   db4         Berkeley DB (libdb4)
+#   db3         Berkeley DB (libdb3)
+#   gdbm_compat GDBM since 1.8.1 (libgdbm_compat)
+#   gdbm        GDBM until 1.8.0 (libgdbm)
+#   qdbm        QDBM (libqdbm)
+#   ndbm        Some legacy OS may have libndbm.
+
 require 'mkmf'
 
 dir_config("dbm")

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