/dev/ptmx doesn't exist on AIX, they had to be different and use /dev/ptc.

Otherwise, the 2 devices seem to work the same for allocating a pseudo-tty.

configure

@@ -1,5 +1,5 @@
 #! /bin/sh
-# From configure.in Revision: 1.393 .
+# From configure.in Revision: 1.394 .
 # Guess values for system-dependent variables and create Makefiles.
 # Generated by GNU Autoconf 2.53 for python 2.3.
 #
@@ -16821,6 +16821,23 @@ else
 echo "${ECHO_T}no" >&6
 fi
 
+echo "$as_me:$LINENO: checking for /dev/ptc" >&5
+echo $ECHO_N "checking for /dev/ptc... $ECHO_C" >&6
+
+if test -e /dev/ptc
+then
+  echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_DEV_PTC 1
+_ACEOF
+
+else
+  echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6
+fi
+
 echo "$as_me:$LINENO: checking for socklen_t" >&5
 echo $ECHO_N "checking for socklen_t... $ECHO_C" >&6
 if test "${ac_cv_type_socklen_t+set}" = set; then

configure.in

@@ -2602,6 +2602,17 @@ else
   AC_MSG_RESULT(no)
 fi
 
+AC_MSG_CHECKING(for /dev/ptc)
+
+if test -e /dev/ptc
+then
+  AC_MSG_RESULT(yes)
+  AC_DEFINE(HAVE_DEV_PTC, 1,
+  [Define if we have /dev/ptc.])
+else
+  AC_MSG_RESULT(no)
+fi
+
 AC_CHECK_TYPE(socklen_t,,
   AC_DEFINE(socklen_t,int,
             Define to `int' if <sys/socket.h> does not define.),[

pyconfig.h.in

@@ -68,6 +68,9 @@
 /* Define to 1 if you have the device macros. */
 #undef HAVE_DEVICE_MACROS
 
+/* Define if we have /dev/ptc. */
+#undef HAVE_DEV_PTC
+
 /* Define if we have /dev/ptmx. */
 #undef HAVE_DEV_PTMX