buildroot/toolchain/uClibc/uClibc-0.9.30.3-xtensa-010-sigaction.c.patch

--- a/libc/sysdeps/linux/xtensa/sigaction.c	2008-09-23 21:11:02.000000000 -0700
+++ b/libc/sysdeps/linux/xtensa/sigaction.c	2008-09-23 21:12:31.000000000 -0700
@@ -17,6 +17,8 @@
 
 #define SA_RESTORER	0x04000000	
 
+extern __typeof(sigaction) __libc_sigaction;
+
 extern void __default_sa_restorer (void);
 
 libc_hidden_proto(memcpy)