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diff --git a/config.h.in b/config.h.in
index c229c73a..f4d7fb17 100644
--- a/config.h.in
+++ b/config.h.in
@@ -42,6 +42,9 @@
 /* Define if you have the <readline/readline.h> header file.  */
 #undef HAVE_READLINE_READLINE_H
 
+/* Define if you have the <sstream> header file.  */
+#undef HAVE_SSTREAM
+
 /* Define if you have the <stdexcept> header file.  */
 #undef HAVE_STDEXCEPT