--- contrib/tools/m4/lib/config-linux.h	(index)
+++ contrib/tools/m4/lib/config-linux.h	(working tree)
@@ -2902,2 +2902,5 @@
 /* Define as a macro for copying va_list variables. */
 /* #undef va_copy */
+#undef HAVE_SYS_SINGLE_THREADED_H
+#define __attribute_maybe_unused__
+#define __attribute_nonnull__(...)