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diff --git a/include/lassert.h b/include/lassert.h
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+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2001 by Henning Meier-Geinitz
+
+   This file is part of the SANE package.
+
+   SANE 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 2 of the License, or (at your
+   option) any later version.
+
+   SANE 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 sane; see the file COPYING.  If not, write to the Free
+   Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+   As a special exception, the authors of SANE give permission for
+   additional uses of the libraries contained in this release of SANE.
+
+   The exception is that, if you link a SANE library with other files
+   to produce an executable, this does not by itself cause the
+   resulting executable to be covered by the GNU General Public
+   License.  Your use of that executable is in no way restricted on
+   account of linking the SANE library code into it.
+
+   This exception does not, however, invalidate any other reasons why
+   the executable file might be covered by the GNU General Public
+   License.
+
+   If you submit changes to SANE to the maintainers to be included in
+   a subsequent release, you agree by submitting the changes that
+   those changes may be distributed with this exception intact.
+
+   If you write modifications of your own for SANE, it is your choice
+   whether to permit this exception to apply to your modifications.
+   If you do not wish that, delete this exception notice.
+
+   Choose suitable implementation of assert.
+*/
+
+#ifndef lassert_h
+#define lassert_h
+
+/* The idea is from the gcc header file assert.h. */
+
+#if defined __GNUC__ && defined _AIX
+/* The implementation of assert of gcc on AIX is in libgcc.a. This 
+   doesn't work with shared libraries. So let's make our own assert(). */
+#define assert(arg)  \
+ ((void) ((arg) ? 0 : lassert (arg, __FILE__, __LINE__)))
+#define lassert(arg, file, lineno)  \
+  (printf ("%s:%u: failed assertion\n", file, lineno),  \
+   abort (), 0)
+#else
+# include <assert.h>
+#endif
+
+#endif /* lassert_h */