--- ./Modules/clinic/posixmodule.c.h_orig	2021-02-11 10:46:43.356483657 -0600
+++ ./Modules/clinic/posixmodule.c.h	2021-02-12 05:05:51.243623150 -0600
@@ -6299,7 +6299,11 @@
     if ((_return_value == (dev_t)-1) && PyErr_Occurred()) {
         goto exit;
     }
+#ifdef _AIX
+    return_value = PyLong_FromUnsignedLong(_return_value);
+#else
     return_value = _PyLong_FromDev(_return_value);
+#endif
 
 exit:
     return return_value;
--- ./Modules/posixmodule.c_orig	2021-02-11 07:12:59.444889426 -0600
+++ .//Modules/posixmodule.c	2021-02-12 05:07:34.587340150 -0600
@@ -179,6 +179,15 @@
 #  include <sys/sysmacros.h>
 #endif
 
+#ifdef _AIX
+#undef minor
+#undef major
+#undef makedev
+#define minor minor64
+#define major major64
+#define makedev makedev64
+#endif
+
 #ifdef HAVE_SYS_TYPES_H
 #  include <sys/types.h>
 #endif /* HAVE_SYS_TYPES_H */
@@ -2316,7 +2325,7 @@
     PyStructSequence_SET_ITEM(v, 0, PyLong_FromLong((long)st->st_mode));
     Py_BUILD_ASSERT(sizeof(unsigned long long) >= sizeof(st->st_ino));
     PyStructSequence_SET_ITEM(v, 1, PyLong_FromUnsignedLongLong(st->st_ino));
-#ifdef MS_WINDOWS
+#if defined(MS_WINDOWS) || defined(_AIX)
     PyStructSequence_SET_ITEM(v, 2, PyLong_FromUnsignedLong(st->st_dev));
 #else
     PyStructSequence_SET_ITEM(v, 2, _PyLong_FromDev(st->st_dev));