diff --git a/src/x86/siglongjmp.S b/src/x86/siglongjmp.S
index e69de29b..0057027c 100644
--- a/src/x86/siglongjmp.S
+++ b/src/x86/siglongjmp.S
@@ -0,0 +1,8 @@
+	/* Dummy implementation for now.  Libunwind-based setjmp/longjmp
+	   can't work on x86 until we take advantage of DWARF2 unwind info.  */
+
+	.globl _UI_siglongjmp_cont
+
+_UI_siglongjmp_cont:
+#warning fix me
+	ret