bpo-43916: Move the _PyStructSequence_InitType function to the internal API (GH-25854)
diff --git a/Objects/structseq.c b/Objects/structseq.c
index bf59f47..73795b6 100644
--- a/Objects/structseq.c
+++ b/Objects/structseq.c
@@ -11,6 +11,7 @@
#include "pycore_tuple.h" // _PyTuple_FromArray()
#include "pycore_object.h" // _PyObject_GC_TRACK()
#include "structmember.h" // PyMemberDef
+#include "pycore_structseq.h" // PyStructSequence_InitType()
static const char visible_length_key[] = "n_sequence_fields";
static const char real_length_key[] = "n_fields";