Index: io.c
===================================================================
--- io.c	(リビジョン 37718)
+++ io.c	(作業コピー)
@@ -136,6 +136,8 @@
 VALUE rb_output_rs;
 VALUE rb_default_rs;
 
+extern VALUE rb_mFConst;
+
 static VALUE argf;
 
 static ID id_write, id_read, id_getc, id_flush, id_readpartial, id_set_encoding;
@@ -11632,7 +11634,10 @@
     rb_define_method(rb_cFile, "initialize",  rb_file_initialize, -1);
 
     /* open for reading only */
+    rb_define_const(rb_mFConst, "RDONLY", INT2FIX(O_RDONLY));
+#if 0
     rb_file_const("RDONLY", INT2FIX(O_RDONLY));
+#endif
     /* open for writing only */
     rb_file_const("WRONLY", INT2FIX(O_WRONLY));
     /* open for reading and writing */
Index: file.c
===================================================================
--- file.c	(リビジョン 37718)
+++ file.c	(作業コピー)
@@ -5513,9 +5513,20 @@
 
     rb_define_method(rb_cFile, "flock", rb_file_flock, 1);
 
+    /*
+     * Document-module: File::Constants
+     *
+     * foo bar.
+     */
     rb_mFConst = rb_define_module_under(rb_cFile, "Constants");
     rb_include_module(rb_cIO, rb_mFConst);
+
+    /* shared lock */
+    rb_define_const(rb_mFConst, "LOCK_SH", INT2FIX(LOCK_SH));
+#if 0
     rb_file_const("LOCK_SH", INT2FIX(LOCK_SH));
+#endif
+    /* exclusive lock */
     rb_file_const("LOCK_EX", INT2FIX(LOCK_EX));
     rb_file_const("LOCK_UN", INT2FIX(LOCK_UN));
     rb_file_const("LOCK_NB", INT2FIX(LOCK_NB));