1 files changed, 2 insertions, 0 deletions
diff --git a/m_option.h b/m_option.h
index 48f94781a3..78ed856f6d 100644
--- a/m_option.h
+++ b/m_option.h
@@ -423,6 +423,8 @@ struct m_option {
 #define ERR_OUT_OF_RANGE        M_OPT_OUT_OF_RANGE
 #define ERR_FUNC_ERR            M_OPT_PARSER_ERR
 
+char *m_option_strerror(int code);
+
 // Find the option matching the given name in the list.
 /** \ingroup Options
  *  This function takes the possible wildcards into account (see