--- plain26/arch/um/os-Linux/process.c.orig	Sun Jul 25 10:10:02 2004
+++ plain26/arch/um/os-Linux/process.c	Sun Jul 25 10:11:39 2004
@@ -93,8 +93,11 @@
 
 void os_usr1_process(int pid)
 {
+#ifdef __NR_tkill
 	syscall(__NR_tkill, pid, SIGUSR1); 
-	/* kill(pid, SIGUSR1); */
+#else
+	kill(pid, SIGUSR1); 
+#endif
 }
 
 int os_getpid(void)