--- swig.orig/Lib/python/pyhead.swg
+++ swig/Lib/python/pyhead.swg
@@ -5,6 +5,7 @@
 #define PyInt_Check(x) PyLong_Check(x)
 #define PyInt_AsLong(x) PyLong_AsLong(x)
 #define PyInt_FromLong(x) PyLong_FromLong(x)
+#define PyInt_FromSize_t(x) PyLong_FromSize_t(x)
 #define PyString_Check(name) PyBytes_Check(name)
 #define PyString_FromString(x) PyUnicode_FromString(x)
 #define PyString_Format(fmt, args)  PyUnicode_Format(fmt, args)