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diff --git a/lib/wait-process.h b/lib/wait-process.h
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+/* Waiting for a subprocess to finish.
+   Copyright (C) 2001-2003, 2006, 2008-2013 Free Software Foundation, Inc.
+   Written by Bruno Haible <haible@clisp.cons.org>, 2001.
+
+   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 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.  */
+
+#ifndef _WAIT_PROCESS_H
+#define _WAIT_PROCESS_H
+
+/* Get pid_t.  */
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+
+#include <stdbool.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* Wait for a subprocess to finish.  Return its exit code.
+   If it didn't terminate correctly, exit if exit_on_error is true, otherwise
+   return 127.
+   Arguments:
+   - child is the pid of the subprocess.
+   - progname is the name of the program executed by the subprocess, used for
+     error messages.
+   - If ignore_sigpipe is true, consider a subprocess termination due to
+     SIGPIPE as equivalent to a success.  This is suitable for processes whose
+     only purpose is to write to standard output.  This flag can be safely set
+     to false when the process' standard output is known to go to DEV_NULL.
+   - If null_stderr is true, the usual error message to stderr will be omitted.
+     This is suitable when the subprocess does not fulfill an important task.
+   - slave_process should be set to true if the process has been launched as a
+     slave process.
+   - If exit_on_error is true, any error will cause the main process to exit
+     with an error status.
+   - If termsigp is not NULL: *termsig will be set to the signal that
+     terminated the subprocess (if supported by the platform: not on native
+     Windows platforms), otherwise 0, and the error message about the signal
+     that terminated the subprocess will be omitted.
+   Prerequisites: The signal handler for SIGCHLD should not be set to SIG_IGN,
+   otherwise this function will not work.  */
+extern int wait_subprocess (pid_t child, const char *progname,
+                            bool ignore_sigpipe, bool null_stderr,
+                            bool slave_process, bool exit_on_error,
+                            int *termsigp);
+
+/* Register a subprocess as being a slave process.  This means that the
+   subprocess will be terminated when its creator receives a catchable fatal
+   signal or exits normally.  Registration ends when wait_subprocess()
+   notices that the subprocess has exited.  */
+extern void register_slave_subprocess (pid_t child);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#endif /* _WAIT_PROCESS_H */