--- Libc/Libc-997.90.3/stdlib/FreeBSD/system.c
+++ Libc/Libc-825.26/stdlib/FreeBSD/system.c
@@ -54,6 +54,9 @@
 
 static pthread_mutex_t __systemfn_mutex = PTHREAD_MUTEX_INITIALIZER;
 extern int __unix_conforming;
+#ifdef VARIANT_CANCELABLE
+extern void _pthread_testcancel(pthread_t thread, int isconforming);
+#endif /* VARIANT_CANCELABLE */
 #endif /* __DARWIN_UNIX03 */
 
 int
@@ -72,7 +75,7 @@
 	if (__unix_conforming == 0)
 		__unix_conforming = 1;
 #ifdef VARIANT_CANCELABLE
-	pthread_testcancel();
+	_pthread_testcancel(pthread_self(), 1);
 #endif /* VARIANT_CANCELABLE */
 #endif /* __DARWIN_UNIX03 */