Py_ssize_t is defined regardless of HAVE_LONG_LONG.  Will backport
diff --git a/Include/structmember.h b/Include/structmember.h
index ce5353d..5b68213 100644
--- a/Include/structmember.h
+++ b/Include/structmember.h
@@ -68,9 +68,11 @@
 #ifdef HAVE_LONG_LONG
 #define T_LONGLONG      17  
 #define T_ULONGLONG      18
-#define T_PYSSIZET       19 /* Py_ssize_t */
 #endif /* HAVE_LONG_LONG */
 
+#define T_PYSSIZET       19 /* Py_ssize_t */
+
+
 /* Flags */
 #define READONLY	1
 #define RO		READONLY		/* Shorthand */