--- a/src/cx/string.h	Sun Jan 14 13:13:12 2024 +0100
+++ b/src/cx/string.h	Sun Jan 14 13:50:17 2024 +0100
@@ -40,6 +40,11 @@
 #include "allocator.h"
 
 /**
+ * The maximum length of the "needle" in cx_strstr() that can use SBO.
+ */
+extern unsigned const cx_strstr_sbo_size;
+
+/**
  * The UCX string structure.
  */
 struct cx_mutstr_s {