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Index: b/usr/src/head/signal.h
===================================================================
--- a/usr/src/head/signal.h
+++ b/usr/src/head/signal.h
@@ -32,7 +32,7 @@
#ifndef _SIGNAL_H
#define _SIGNAL_H
-#include <sys/feature_tests.h>
+#include <features.h>
#if defined(__EXTENSIONS__) || !defined(_STRICT_STDC) || \
defined(__XOPEN_OR_POSIX)
@@ -56,6 +56,13 @@ using std::raise;
extern "C" {
#endif
+typedef void (*__sighandler_t)(int);
+#ifdef _GNU_SOURCE
+typedef __sighandler_t sighandler_t;
+#endif
+#ifdef __EXTENSIONS__
+typedef __sighandler_t sig_t;
+#endif
extern const char **_sys_siglistp; /* signal descriptions */
extern const int _sys_siglistn; /* # of signal descriptions */
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