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diff --git a/libcpp/include/mkdeps.h b/libcpp/include/mkdeps.h
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+/* Dependency generator for Makefile fragments.
+   Copyright (C) 2000, 2001, 2003, 2009 Free Software Foundation, Inc.
+   Contributed by Zack Weinberg, Mar 2000
+
+This program 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 3, or (at your option) any
+later version.
+
+This program 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 this program; see the file COPYING3.  If not see
+<http://www.gnu.org/licenses/>.
+
+ In other words, you are welcome to use, share and improve this program.
+ You are forbidden to forbid anyone else to use, share and improve
+ what you give them.   Help stamp out software-hoarding!  */
+
+#ifndef LIBCPP_MKDEPS_H
+#define LIBCPP_MKDEPS_H
+
+/* This is the data structure used by all the functions in mkdeps.c.
+   It's quite straightforward, but should be treated as opaque.  */
+
+struct deps;
+
+/* Create a deps buffer.  */
+extern struct deps *deps_init (void);
+
+/* Destroy a deps buffer.  */
+extern void deps_free (struct deps *);
+
+/* Add a set of "vpath" directories. The second argument is a colon-
+   separated list of pathnames, like you would set Make's VPATH
+   variable to.  If a dependency or target name begins with any of
+   these pathnames (and the next path element is not "..") that
+   pathname is stripped off.  */
+extern void deps_add_vpath (struct deps *, const char *);
+
+/* Add a target (appears on left side of the colon) to the deps list.  Takes
+   a boolean indicating whether to quote the target for MAKE.  */
+extern void deps_add_target (struct deps *, const char *, int);
+
+/* Sets the default target if none has been given already.  An empty
+   string as the default target is interpreted as stdin.  */
+extern void deps_add_default_target (struct deps *, const char *);
+
+/* Add a dependency (appears on the right side of the colon) to the
+   deps list.  Dependencies will be printed in the order that they
+   were entered with this function.  By convention, the first
+   dependency entered should be the primary source file.  */
+extern void deps_add_dep (struct deps *, const char *);
+
+/* Write out a deps buffer to a specified file.  The third argument
+   is the number of columns to word-wrap at (0 means don't wrap).  */
+extern void deps_write (const struct deps *, FILE *, unsigned int);
+
+/* Write out a deps buffer to a file, in a form that can be read back
+   with deps_restore.  Returns nonzero on error, in which case the
+   error number will be in errno.  */
+extern int deps_save (struct deps *, FILE *);
+
+/* Read back dependency information written with deps_save into
+   the deps buffer.  The third argument may be NULL, in which case
+   the dependency information is just skipped, or it may be a filename,
+   in which case that filename is skipped.  */
+extern int deps_restore (struct deps *, FILE *, const char *);
+
+/* For each dependency *except the first*, emit a dummy rule for that
+   file, causing it to depend on nothing.  This is used to work around
+   the intermediate-file deletion misfeature in Make, in some
+   automatic dependency schemes.  */
+extern void deps_phony_targets (const struct deps *, FILE *);
+
+#endif /* ! LIBCPP_MKDEPS_H */