added the inclusion guard

the vc check can be likely removed, to be checked

diff --git a/win32/signal.h b/win32/signal.h
index a131e6ef99785fd9c932c7298f0a69700ec3956a..8d4f411d21078fcdf46ea2e23f4f7bbbc48fa85c 100644 (file)
--- a/win32/signal.h
+++ b/win32/signal.h
@@ -1,3 +1,6 @@
+#ifndef PHP_WIN32_SIGNAL_H
+#define PHP_WIN32_SIGNAL_H
+
 #if _MSC_VER >= 1900
 #include <signal.h>
 #else
@@ -18,3 +21,5 @@
 #define SIGALRM 13
 #define        SIGVTALRM 26                    /* virtual time alarm */
 #define        SIGPROF 27                              /* profiling time alarm */
+
+#endif /* PHP_WIN32_SIGNAL_H */