Index: uspace/lib/libc/include/thread.h
===================================================================
--- uspace/lib/libc/include/thread.h	(revision 116d3f6f655456c410fc698142213ee6eceee904)
+++ uspace/lib/libc/include/thread.h	(revision bb54db8adf4487558f5ccf7da52b4bf5f49cd8da)
@@ -42,4 +42,6 @@
 typedef uint64_t thread_id_t;
 
+extern char _tls_alignment;
+
 extern void __thread_entry(void);
 extern void __thread_main(uspace_arg_t *uarg);