--- librtas-1.2.4/librtas_src/syscall_calls.c.no_syscall	2006-08-01 10:08:03.000000000 -0400
+++ librtas-1.2.4/librtas_src/syscall_calls.c	2006-08-01 10:09:22.000000000 -0400
@@ -93,7 +93,15 @@
 	.interface_exists = sc_interface_exists,
 };
 
+/* The original librtas used the _syscall1 interface to get to the rtas
+ * system call.  On recent versions of Linux though the _syscall1
+ * interface was removed from unistd.h so we have moved to using the
+ * syscall() interface instead.  The use of _syscall1 is left as the
+ * default to avoid breaking the library on older systems.
+ */
+#ifdef _syscall1
 _syscall1(int, rtas, void *, args);
+#endif
 
 #define CALL_AGAIN 1
 
@@ -201,7 +209,11 @@
 	va_end(ap);
 
 	display_rtas_buf(&args, 0);
+#ifdef _syscall1
 	rc = rtas(&args);
+#else
+        rc = syscall(__NR_rtas, &args);
+#endif
 	if (rc != 0) {
 		dbg1("RTAS syscall failure, errno=%d\n", errno);
 		return RTAS_IO_ASSERT;