There are additional stubs in libpthread.
---
 include/stubs-biarch.h |    2 ++
 1 file changed, 2 insertions(+)

--- a/include/stubs-biarch.h
+++ b/include/stubs-biarch.h
@@ -10,3 +10,5 @@
 #else
 # error "unexpected value for __WORDSIZE macro"
 #endif
+
+#include <gnu/stubs-pthread.h>