should be it

external/duckdb/extension/json/json_config.py

@@ -0,0 +1,16 @@
+import os
+
+# list all include directories
+include_directories = [os.path.sep.join(x.split('/')) for x in ['extension/json/include']]
+
+
+# source files
+def list_files_recursive(rootdir, suffix):
+    file_list = []
+    for root, _, files in os.walk(rootdir):
+        file_list += [os.path.join(root, f) for f in files if f.endswith(suffix)]
+    return file_list
+
+
+prefix = os.path.join('extension', 'json')
+source_files = list_files_recursive(prefix, '.cpp')