some preliminaries for adding POSIX timers
diff --git a/src/internal/pthread_impl.h b/src/internal/pthread_impl.h
index c8fa4b1..615b963 100644
--- a/src/internal/pthread_impl.h
+++ b/src/internal/pthread_impl.h
@@ -43,6 +43,10 @@
 	} robust_list;
 };
 
+struct __timer {
+	struct sigevent sev;
+};
+
 #define __SU (sizeof(size_t)/sizeof(int))
 
 #define _a_stacksize __u.__s[0]