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diff --git a/src/lastfile.c b/src/lastfile.c
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+/* Mark end of data space to dump as pure, for GNU Emacs.
+   Copyright (C) 1985 Free Software Foundation, Inc.
+
+This file is part of GNU Emacs.
+
+GNU Emacs is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GNU Emacs is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Emacs; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+/* How this works:
+
+ Fdump_emacs dumps everything up to my_edata as text space (pure).
+
+ The files of Emacs are written so as to have no initialized
+ data that can ever need to be altered except at the first startup.
+ This is so that those words can be dumped as sharable text.
+
+ It is not possible to exercise such control over library files.
+ So it is necessary to refrain from making their data areas shared.
+ Therefore, this file is loaded following all the files of Emacs
+ but before library files.
+ As a result, the symbol my_edata indicates the point
+ in data space between data coming from Emacs and data
+ coming from libraries.
+*/
+
+char my_edata = 0;