diff --git a/bits/sigstack.h b/bits/sigstack.h
index 42143e3..3127c32 100644
--- a/bits/sigstack.h
+++ b/bits/sigstack.h
@@ -23,33 +23,6 @@
 # error "Never include this file directly.  Use <signal.h> instead"
 #endif
 
-
-/* Structure describing a signal stack (obsolete).  */
-struct sigstack
-  {
-    __ptr_t ss_sp;		/* Signal stack pointer.  */
-    int ss_onstack;		/* Nonzero if executing on this stack.  */
-  };
-
-
-/* Alternate, preferred interface.  */
-typedef struct sigaltstack
-  {
-    __ptr_t ss_sp;
-    size_t ss_size;
-    int ss_flags;
-  } stack_t;
-
-
-/* Possible values for `ss_flags.'.  */
-enum
-{
-  SS_ONSTACK = 0x0001,
-#define SS_ONSTACK	SS_ONSTACK
-  SS_DISABLE = 0x0004
-#define SS_DISABLE	SS_DISABLE
-};
-
 /* Minumum stack size for a signal handler.  */
 #define MINSIGSTKSZ	8192
 
diff --git a/bits/ss_flags.h b/bits/ss_flags.h
new file mode 100644
index 0000000..fa3836c
--- /dev/null
+++ b/bits/ss_flags.h
@@ -0,0 +1,35 @@
+/* ss_flags values for stack_t.
+   Copyright (C) 1998-2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_SS_FLAGS_H
+#define _BITS_SS_FLAGS_H 1
+
+#if !defined _SIGNAL_H && !defined _SYS_UCONTEXT_H
+# error "Never include this file directly.  Use <signal.h> instead"
+#endif
+
+/* Possible values for `ss_flags.'.  */
+enum
+{
+  SS_ONSTACK = 0x0001,
+#define SS_ONSTACK	SS_ONSTACK
+  SS_DISABLE = 0x0004
+#define SS_DISABLE	SS_DISABLE
+};
+
+#endif /* bits/ss_flags.h */
diff --git a/bits/types/stack_t.h b/bits/types/stack_t.h
new file mode 100644
index 0000000..3cf0a40
--- /dev/null
+++ b/bits/types/stack_t.h
@@ -0,0 +1,33 @@
+/* Define stack_t.
+   Copyright (C) 1998-2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef __stack_t_defined
+#define __stack_t_defined 1
+
+#define __need_size_t
+#include <stddef.h>
+
+/* Structure describing a signal stack.  */
+typedef struct sigaltstack
+  {
+    void *ss_sp;
+    size_t ss_size;
+    int ss_flags;
+  } stack_t;
+
+#endif
diff --git a/include/bits/types/struct_sigstack.h b/include/bits/types/struct_sigstack.h
new file mode 100644
index 0000000..05f1ee5
--- /dev/null
+++ b/include/bits/types/struct_sigstack.h
@@ -0,0 +1 @@
+#include "../../signal/bits/types/struct_sigstack.h"
diff --git a/signal/Makefile b/signal/Makefile
index b65bf6b..077aaea 100644
--- a/signal/Makefile
+++ b/signal/Makefile
@@ -24,7 +24,8 @@ include ../Makeconfig
 
 headers	:= signal.h sys/signal.h bits/signum.h bits/sigcontext.h \
 	   bits/sigaction.h bits/sigset.h bits/siginfo.h bits/sigstack.h \
-	   bits/sigthread.h
+	   bits/sigthread.h bits/types/struct_sigstack.h bits/types/stack_t.h \
+	   bits/ss_flags.h
 
 routines	:= signal raise killpg \
 		   sigaction sigprocmask kill \
diff --git a/signal/bits/types/struct_sigstack.h b/signal/bits/types/struct_sigstack.h
new file mode 100644
index 0000000..5e93ce0
--- /dev/null
+++ b/signal/bits/types/struct_sigstack.h
@@ -0,0 +1,29 @@
+/* Define struct sigstack.
+   Copyright (C) 1998-2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef __sigstack_defined
+#define __sigstack_defined 1
+
+/* Structure describing a signal stack (obsolete).  */
+struct sigstack
+  {
+    void *ss_sp;		/* Signal stack pointer.  */
+    int ss_onstack;		/* Nonzero if executing on this stack.  */
+  };
+
+#endif
diff --git a/signal/signal.h b/signal/signal.h
index 6db2d2f..d01df32 100644
--- a/signal/signal.h
+++ b/signal/signal.h
@@ -314,6 +314,9 @@ extern int sigreturn (struct sigcontext *__scp) __THROW;
 extern int siginterrupt (int __sig, int __interrupt) __THROW;
 
 # include <bits/sigstack.h>
+# include <bits/types/struct_sigstack.h>
+# include <bits/types/stack_t.h>
+# include <bits/ss_flags.h>
 # if defined __USE_XOPEN || defined __USE_XOPEN2K8
 /* This will define `ucontext_t' and `mcontext_t'.  */
 #  include <sys/ucontext.h>
diff --git a/sysdeps/arm/sys/ucontext.h b/sysdeps/arm/sys/ucontext.h
index 09fe418..49d6039 100644
--- a/sysdeps/arm/sys/ucontext.h
+++ b/sysdeps/arm/sys/ucontext.h
@@ -27,6 +27,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 typedef int greg_t;
diff --git a/sysdeps/generic/sys/ucontext.h b/sysdeps/generic/sys/ucontext.h
index 6c475b5..052c540 100644
--- a/sysdeps/generic/sys/ucontext.h
+++ b/sysdeps/generic/sys/ucontext.h
@@ -29,6 +29,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 typedef struct sigcontext mcontext_t;
diff --git a/sysdeps/i386/sys/ucontext.h b/sysdeps/i386/sys/ucontext.h
index c632e50..241f270 100644
--- a/sysdeps/i386/sys/ucontext.h
+++ b/sysdeps/i386/sys/ucontext.h
@@ -27,6 +27,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 /* Type for general register.  */
diff --git a/sysdeps/m68k/sys/ucontext.h b/sysdeps/m68k/sys/ucontext.h
index cbec1db..4e5ec3b 100644
--- a/sysdeps/m68k/sys/ucontext.h
+++ b/sysdeps/m68k/sys/ucontext.h
@@ -27,6 +27,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 /* Type for general register.  */
diff --git a/sysdeps/mips/sys/ucontext.h b/sysdeps/mips/sys/ucontext.h
index 137246f..cb8fbcd 100644
--- a/sysdeps/mips/sys/ucontext.h
+++ b/sysdeps/mips/sys/ucontext.h
@@ -27,6 +27,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 #include <sgidefs.h>
 
diff --git a/sysdeps/unix/sysv/linux/aarch64/bits/sigstack.h b/sysdeps/unix/sysv/linux/aarch64/bits/sigstack.h
index a1f2acc..434b24e 100644
--- a/sysdeps/unix/sysv/linux/aarch64/bits/sigstack.h
+++ b/sysdeps/unix/sysv/linux/aarch64/bits/sigstack.h
@@ -23,33 +23,6 @@
 # error "Never include this file directly.  Use <signal.h> instead"
 #endif
 
-#define __need_size_t
-#include <stddef.h>
-
-/* Structure describing a signal stack (obsolete).  */
-struct sigstack
-  {
-    void *ss_sp;		/* Signal stack pointer.  */
-    int ss_onstack;		/* Nonzero if executing on this stack.  */
-  };
-
-/* Alternate, preferred interface.  */
-typedef struct sigaltstack
-  {
-    void *ss_sp;
-    int ss_flags;
-    size_t ss_size;
-  } stack_t;
-
-/* 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.  */
 #define MINSIGSTKSZ	5120
 
diff --git a/sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h b/sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h
index 536404d..1a5fa29 100644
--- a/sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/aarch64/sys/ucontext.h
@@ -28,6 +28,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 #ifdef __USE_MISC
 # include <sys/procfs.h>
diff --git a/sysdeps/unix/sysv/linux/alpha/bits/sigstack.h b/sysdeps/unix/sysv/linux/alpha/bits/sigstack.h
index bba0212..9a30c9d 100644
--- a/sysdeps/unix/sysv/linux/alpha/bits/sigstack.h
+++ b/sysdeps/unix/sysv/linux/alpha/bits/sigstack.h
@@ -23,33 +23,6 @@
 # error "Never include this file directly.  Use <signal.h> instead"
 #endif
 
-#define __need_size_t
-#include <stddef.h>
-
-/* Structure describing a signal stack (obsolete).  */
-struct sigstack
-  {
-    __ptr_t ss_sp;		/* Signal stack pointer.  */
-    int ss_onstack;		/* Nonzero if executing on this stack.  */
-  };
-
-/* Alternate, preferred interface.  */
-typedef struct sigaltstack
-  {
-    __ptr_t ss_sp;
-    int ss_flags;
-    size_t ss_size;
-  } stack_t;
-
-/* 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.  */
 #define MINSIGSTKSZ	4096
 
diff --git a/sysdeps/unix/sysv/linux/alpha/sys/ucontext.h b/sysdeps/unix/sysv/linux/alpha/sys/ucontext.h
index dc76e49..912c61c 100644
--- a/sysdeps/unix/sysv/linux/alpha/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/alpha/sys/ucontext.h
@@ -25,6 +25,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 /* Type for general register.  */
diff --git a/sysdeps/unix/sysv/linux/arm/sys/ucontext.h b/sysdeps/unix/sysv/linux/arm/sys/ucontext.h
index aedeccd..8a5ea71 100644
--- a/sysdeps/unix/sysv/linux/arm/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/arm/sys/ucontext.h
@@ -27,6 +27,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 #ifdef __USE_MISC
diff --git a/sysdeps/unix/sysv/linux/bits/sigstack.h b/sysdeps/unix/sysv/linux/bits/sigstack.h
index a0c3a9f..e6b6c7e 100644
--- a/sysdeps/unix/sysv/linux/bits/sigstack.h
+++ b/sysdeps/unix/sysv/linux/bits/sigstack.h
@@ -23,33 +23,6 @@
 # error "Never include this file directly.  Use <signal.h> instead"
 #endif
 
-#define __need_size_t
-#include <stddef.h>
-
-/* Structure describing a signal stack (obsolete).  */
-struct sigstack
-  {
-    void *ss_sp;		/* Signal stack pointer.  */
-    int ss_onstack;		/* Nonzero if executing on this stack.  */
-  };
-
-/* Alternate, preferred interface.  */
-typedef struct sigaltstack
-  {
-    void *ss_sp;
-    int ss_flags;
-    size_t ss_size;
-  } stack_t;
-
-/* 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.  */
 #define MINSIGSTKSZ	2048
 
diff --git a/sysdeps/unix/sysv/linux/bits/ss_flags.h b/sysdeps/unix/sysv/linux/bits/ss_flags.h
new file mode 100644
index 0000000..497b613
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/bits/ss_flags.h
@@ -0,0 +1,35 @@
+/* ss_flags values for stack_t.  Linux version.
+   Copyright (C) 1998-2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef _BITS_SS_FLAGS_H
+#define _BITS_SS_FLAGS_H 1
+
+#if !defined _SIGNAL_H && !defined _SYS_UCONTEXT_H
+# error "Never include this file directly.  Use <signal.h> instead"
+#endif
+
+/* Possible values for `ss_flags'.  */
+enum
+{
+  SS_ONSTACK = 1,
+#define SS_ONSTACK	SS_ONSTACK
+  SS_DISABLE
+#define SS_DISABLE	SS_DISABLE
+};
+
+#endif /* bits/ss_flags.h */
diff --git a/sysdeps/unix/sysv/linux/bits/types/stack_t.h b/sysdeps/unix/sysv/linux/bits/types/stack_t.h
new file mode 100644
index 0000000..497e42b
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/bits/types/stack_t.h
@@ -0,0 +1,33 @@
+/* Define stack_t.  Linux version.
+   Copyright (C) 1998-2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef __stack_t_defined
+#define __stack_t_defined 1
+
+#define __need_size_t
+#include <stddef.h>
+
+/* Structure describing a signal stack.  */
+typedef struct sigaltstack
+  {
+    void *ss_sp;
+    int ss_flags;
+    size_t ss_size;
+  } stack_t;
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/hppa/sys/ucontext.h b/sysdeps/unix/sysv/linux/hppa/sys/ucontext.h
index 31eb77e..50e585d 100644
--- a/sysdeps/unix/sysv/linux/hppa/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/hppa/sys/ucontext.h
@@ -27,6 +27,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 #ifdef __USE_MISC
diff --git a/sysdeps/unix/sysv/linux/ia64/bits/sigcontext.h b/sysdeps/unix/sysv/linux/ia64/bits/sigcontext.h
index c9a0689..c81463d 100644
--- a/sysdeps/unix/sysv/linux/ia64/bits/sigcontext.h
+++ b/sysdeps/unix/sysv/linux/ia64/bits/sigcontext.h
@@ -26,6 +26,9 @@
 #define __need_size_t
 #include <stddef.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 struct __ia64_fpreg
   {
diff --git a/sysdeps/unix/sysv/linux/ia64/bits/sigstack.h b/sysdeps/unix/sysv/linux/ia64/bits/sigstack.h
index abae4c9..aabefbb 100644
--- a/sysdeps/unix/sysv/linux/ia64/bits/sigstack.h
+++ b/sysdeps/unix/sysv/linux/ia64/bits/sigstack.h
@@ -23,33 +23,6 @@
 # error "Never include this file directly.  Use <signal.h> instead"
 #endif
 
-#define __need_size_t
-#include <stddef.h>
-
-/* Structure describing a signal stack (obsolete).  */
-struct sigstack
-  {
-    __ptr_t ss_sp;		/* Signal stack pointer.  */
-    int ss_onstack;		/* Nonzero if executing on this stack.  */
-  };
-
-/* Alternate, preferred interface.  */
-typedef struct sigaltstack
-  {
-    __ptr_t ss_sp;
-    int ss_flags;
-    size_t ss_size;
-  } stack_t;
-
-/* 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
diff --git a/sysdeps/unix/sysv/linux/ia64/sys/ucontext.h b/sysdeps/unix/sysv/linux/ia64/sys/ucontext.h
index b2dab0e..17474a5 100644
--- a/sysdeps/unix/sysv/linux/ia64/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/ia64/sys/ucontext.h
@@ -25,6 +25,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 /*
diff --git a/sysdeps/unix/sysv/linux/m68k/sys/ucontext.h b/sysdeps/unix/sysv/linux/m68k/sys/ucontext.h
index 3c5dce5..18ff022 100644
--- a/sysdeps/unix/sysv/linux/m68k/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/m68k/sys/ucontext.h
@@ -27,6 +27,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 /* Type for general register.  */
diff --git a/sysdeps/unix/sysv/linux/mips/bits/sigstack.h b/sysdeps/unix/sysv/linux/mips/bits/sigstack.h
deleted file mode 100644
index 215f2ff..0000000
--- a/sysdeps/unix/sysv/linux/mips/bits/sigstack.h
+++ /dev/null
@@ -1,59 +0,0 @@
-/* sigstack, sigaltstack definitions.
-   Copyright (C) 1998-2017 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, see
-   <http://www.gnu.org/licenses/>.  */
-
-#ifndef _BITS_SIGSTACK_H
-#define _BITS_SIGSTACK_H 1
-
-#if !defined _SIGNAL_H && !defined _SYS_UCONTEXT_H
-# error "Never include this file directly.  Use <signal.h> instead"
-#endif
-
-#define __need_size_t
-#include <stddef.h>
-
-/* Structure describing a signal stack (obsolete).  */
-struct sigstack
-  {
-    void *ss_sp;		/* Signal stack pointer.  */
-    int ss_onstack;		/* Nonzero if executing on this stack.  */
-  };
-
-/* Alternate, preferred interface.  */
-typedef struct sigaltstack
-  {
-    void *ss_sp;
-    size_t ss_size;
-    int ss_flags;
-  } stack_t;
-
-/* 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.  */
-#define MINSIGSTKSZ	2048
-
-/* System default stack size.  */
-#define SIGSTKSZ	8192
-
-#endif /* bits/sigstack.h */
diff --git a/sysdeps/unix/sysv/linux/mips/bits/types/stack_t.h b/sysdeps/unix/sysv/linux/mips/bits/types/stack_t.h
new file mode 100644
index 0000000..ef06072
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mips/bits/types/stack_t.h
@@ -0,0 +1,33 @@
+/* Define stack_t.  MIPS Linux version.
+   Copyright (C) 1998-2017 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, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef __stack_t_defined
+#define __stack_t_defined 1
+
+#define __need_size_t
+#include <stddef.h>
+
+/* Structure describing a signal stack.  */
+typedef struct sigaltstack
+  {
+    void *ss_sp;
+    size_t ss_size;
+    int ss_flags;
+  } stack_t;
+
+#endif
diff --git a/sysdeps/unix/sysv/linux/mips/sys/ucontext.h b/sysdeps/unix/sysv/linux/mips/sys/ucontext.h
index f766dac..f933780 100644
--- a/sysdeps/unix/sysv/linux/mips/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/mips/sys/ucontext.h
@@ -26,6 +26,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 #include <sgidefs.h>
 
diff --git a/sysdeps/unix/sysv/linux/nios2/sys/ucontext.h b/sysdeps/unix/sysv/linux/nios2/sys/ucontext.h
index 3b0a615..c961e5b 100644
--- a/sysdeps/unix/sysv/linux/nios2/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/nios2/sys/ucontext.h
@@ -28,6 +28,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 /* These definitions must be in sync with the kernel.  */
diff --git a/sysdeps/unix/sysv/linux/powerpc/bits/sigstack.h b/sysdeps/unix/sysv/linux/powerpc/bits/sigstack.h
index 4a36ad1..74670cb 100644
--- a/sysdeps/unix/sysv/linux/powerpc/bits/sigstack.h
+++ b/sysdeps/unix/sysv/linux/powerpc/bits/sigstack.h
@@ -23,33 +23,6 @@
 # error "Never include this file directly.  Use <signal.h> instead"
 #endif
 
-#define __need_size_t
-#include <stddef.h>
-
-/* Structure describing a signal stack (obsolete).  */
-struct sigstack
-  {
-    void *ss_sp;		/* Signal stack pointer.  */
-    int ss_onstack;		/* Nonzero if executing on this stack.  */
-  };
-
-/* Alternate, preferred interface.  */
-typedef struct sigaltstack
-  {
-    void *ss_sp;
-    int ss_flags;
-    size_t ss_size;
-  } stack_t;
-
-/* 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.  */
 #define MINSIGSTKSZ	4096
 
diff --git a/sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h b/sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h
index c3f9622..d9fad4c 100644
--- a/sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/powerpc/sys/ucontext.h
@@ -26,6 +26,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 #if __WORDSIZE == 32
diff --git a/sysdeps/unix/sysv/linux/s390/sys/ucontext.h b/sysdeps/unix/sysv/linux/s390/sys/ucontext.h
index 9790c0c..955a8fe 100644
--- a/sysdeps/unix/sysv/linux/s390/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/s390/sys/ucontext.h
@@ -26,6 +26,9 @@
    by in <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 /* Type for a program status word.  */
diff --git a/sysdeps/unix/sysv/linux/sh/sys/ucontext.h b/sysdeps/unix/sysv/linux/sh/sys/ucontext.h
index 5c6a5e4..3ce381d 100644
--- a/sysdeps/unix/sysv/linux/sh/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/sh/sys/ucontext.h
@@ -27,6 +27,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 typedef int greg_t;
diff --git a/sysdeps/unix/sysv/linux/sparc/bits/sigstack.h b/sysdeps/unix/sysv/linux/sparc/bits/sigstack.h
index 4a36ad1..74670cb 100644
--- a/sysdeps/unix/sysv/linux/sparc/bits/sigstack.h
+++ b/sysdeps/unix/sysv/linux/sparc/bits/sigstack.h
@@ -23,33 +23,6 @@
 # error "Never include this file directly.  Use <signal.h> instead"
 #endif
 
-#define __need_size_t
-#include <stddef.h>
-
-/* Structure describing a signal stack (obsolete).  */
-struct sigstack
-  {
-    void *ss_sp;		/* Signal stack pointer.  */
-    int ss_onstack;		/* Nonzero if executing on this stack.  */
-  };
-
-/* Alternate, preferred interface.  */
-typedef struct sigaltstack
-  {
-    void *ss_sp;
-    int ss_flags;
-    size_t ss_size;
-  } stack_t;
-
-/* 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.  */
 #define MINSIGSTKSZ	4096
 
diff --git a/sysdeps/unix/sysv/linux/sparc/sys/ucontext.h b/sysdeps/unix/sysv/linux/sparc/sys/ucontext.h
index b8f3ca7..0d6cbe6 100644
--- a/sysdeps/unix/sysv/linux/sparc/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/sparc/sys/ucontext.h
@@ -25,6 +25,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 #include <bits/wordsize.h>
 
diff --git a/sysdeps/unix/sysv/linux/tile/sys/ucontext.h b/sysdeps/unix/sysv/linux/tile/sys/ucontext.h
index 95e6dd6..8fc2f13 100644
--- a/sysdeps/unix/sysv/linux/tile/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/tile/sys/ucontext.h
@@ -26,6 +26,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 #ifdef __USE_MISC
 /* Get register type and register names. */
diff --git a/sysdeps/unix/sysv/linux/x86/sys/ucontext.h b/sysdeps/unix/sysv/linux/x86/sys/ucontext.h
index 6dad48f..5dd72ac 100644
--- a/sysdeps/unix/sysv/linux/x86/sys/ucontext.h
+++ b/sysdeps/unix/sysv/linux/x86/sys/ucontext.h
@@ -25,6 +25,9 @@
    by <signal.h>.  */
 #include <bits/sigcontext.h>
 #include <bits/sigstack.h>
+#include <bits/types/struct_sigstack.h>
+#include <bits/types/stack_t.h>
+#include <bits/ss_flags.h>
 
 
 #ifdef __x86_64__
