Use Py_GCC_ATTRIBUTE instead of __attribute__.  Compilers other than GCC
might use __attribute__ in other ways (e.g. CodeWarrior).
diff --git a/Include/stringobject.h b/Include/stringobject.h
index ff30704..7f67a1f 100644
--- a/Include/stringobject.h
+++ b/Include/stringobject.h
@@ -52,9 +52,9 @@
 PyAPI_FUNC(PyObject *) PyString_FromStringAndSize(const char *, int);
 PyAPI_FUNC(PyObject *) PyString_FromString(const char *);
 PyAPI_FUNC(PyObject *) PyString_FromFormatV(const char*, va_list)
-				__attribute__((format(printf, 1, 0)));
+				Py_GCC_ATTRIBUTE((format(printf, 1, 0)));
 PyAPI_FUNC(PyObject *) PyString_FromFormat(const char*, ...)
-				__attribute__((format(printf, 1, 2)));
+				Py_GCC_ATTRIBUTE((format(printf, 1, 2)));
 PyAPI_FUNC(int) PyString_Size(PyObject *);
 PyAPI_FUNC(char *) PyString_AsString(PyObject *);
 PyAPI_FUNC(PyObject *) PyString_Repr(PyObject *, int);