py: Add support to call __init__ from a builtin module on first import.
diff --git a/py/mpconfig.h b/py/mpconfig.h
index 500af5e..ad2fe3e 100644
--- a/py/mpconfig.h
+++ b/py/mpconfig.h
@@ -406,6 +406,11 @@
 #define MICROPY_STREAMS_NON_BLOCK (0)
 #endif
 
+// Whether to call __init__ when importing builtin modules for the first time
+#ifndef MICROPY_MODULE_BUILTIN_INIT
+#define MICROPY_MODULE_BUILTIN_INIT (0)
+#endif
+
 // Whether module weak links are supported
 #ifndef MICROPY_MODULE_WEAK_LINKS
 #define MICROPY_MODULE_WEAK_LINKS (0)