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diff --git a/libc/sysdeps/linux/ia64/bits/sigstack.h b/libc/sysdeps/linux/ia64/bits/sigstack.h
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+/* sigstack, sigaltstack definitions.
+ Copyright (C) 1998, 2000, 2002, 2003 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _SIGNAL_H
+# error "Never include this file directly. Use <signal.h> instead"
+#endif
+
+#ifndef _SIGSTACK_H
+#define _SIGSTACK_H 1
+
+/* Structure describing a signal stack (obsolete). */
+struct sigstack
+ {
+ __ptr_t ss_sp; /* Signal stack pointer. */
+ int ss_onstack; /* Nonzero if executing on this stack. */
+ };
+
+
+/* Possible values for `ss_flags.'. */
+enum
+{
+ SS_ONSTACK = 1,
+#define SS_ONSTACK SS_ONSTACK
+ SS_DISABLE
+#define SS_DISABLE SS_DISABLE
+};
+
+/* Minimum stack size for a signal handler.
+
+ Yes, this should be 131072 but the constant got defined incorrectly
+ in the kernel and we have to live with it. Users should in any case
+ use SIGSTKSZ as the size user-supplied buffers should have. */
+#define MINSIGSTKSZ 131027
+
+/* System default stack size. */
+#define SIGSTKSZ 262144
+
+
+/* Alternate, preferred interface. */
+typedef struct sigaltstack
+ {
+ __ptr_t ss_sp;
+ int ss_flags;
+ size_t ss_size;
+ } stack_t;
+
+#endif /* bits/sigstack.h */