--- liborcus-0.15.3/src/liborcus/json_map_tree.cpp	2019-08-02 19:31:14.000000000 -0400
+++ liborcus-0.15.3/src/liborcus/json_map_tree.cpp	2020-02-06 23:35:09.274550724 -0500
@@ -14,6 +14,8 @@
 
 namespace orcus {
 
+constexpr json_map_tree::child_position_type json_map_tree::node_child_default_position;
+
 namespace {
 
 void throw_path_error(const char* file, int line, const pstring& path)