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-rw-r--r--sysdeps/mach/hurd/alpha/bits/sigcontext.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/sysdeps/mach/hurd/alpha/bits/sigcontext.h b/sysdeps/mach/hurd/alpha/bits/sigcontext.h
index 3b17a4ada8..a2c8163599 100644
--- a/sysdeps/mach/hurd/alpha/bits/sigcontext.h
+++ b/sysdeps/mach/hurd/alpha/bits/sigcontext.h
@@ -17,6 +17,10 @@
    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
    Boston, MA 02111-1307, USA.  */
 
+#ifndef _SIGNAL_H
+# error "Never use <bits/sigcontext.h> directly; include <signal.h> instead."
+#endif
+
 /* Signal handlers are actually called:
    void handler (int sig, int code, struct sigcontext *scp);  */