diff --git a/Include/pyport.h b/Include/pyport.h
index 899d3d0..85e852f 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -93,9 +93,12 @@
  * uint32_t to be such a type unless stdint.h or inttypes.h defines uint32_t.
  * However, it doesn't set HAVE_UINT32_T, so we do that here.
  */
-#if (defined UINT32_MAX || defined uint32_t)
-#ifndef PY_UINT32_T
+#ifdef uint32_t
 #define HAVE_UINT32_T 1
+#endif
+
+#ifdef HAVE_UINT32_T
+#ifndef PY_UINT32_T
 #define PY_UINT32_T uint32_t
 #endif
 #endif
@@ -103,23 +106,33 @@
 /* Macros for a 64-bit unsigned integer type; used for type 'twodigits' in the
  * long integer implementation, when 30-bit digits are enabled.
  */
-#if (defined UINT64_MAX || defined uint64_t)
-#ifndef PY_UINT64_T
+#ifdef uint64_t
 #define HAVE_UINT64_T 1
+#endif
+
+#ifdef HAVE_UINT64_T
+#ifndef PY_UINT64_T
 #define PY_UINT64_T uint64_t
 #endif
 #endif
 
 /* Signed variants of the above */
-#if (defined INT32_MAX || defined int32_t)
-#ifndef PY_INT32_T
+#ifdef int32_t
 #define HAVE_INT32_T 1
+#endif
+
+#ifdef HAVE_INT32_T
+#ifndef PY_INT32_T
 #define PY_INT32_T int32_t
 #endif
 #endif
-#if (defined INT64_MAX || defined int64_t)
-#ifndef PY_INT64_T
+
+#ifdef int64_t
 #define HAVE_INT64_T 1
+#endif
+
+#ifdef HAVE_INT64_T
+#ifndef PY_INT64_T
 #define PY_INT64_T int64_t
 #endif
 #endif
diff --git a/configure b/configure
index 2295f05..b17097c 100755
--- a/configure
+++ b/configure
@@ -6703,6 +6703,21 @@
 
 fi
 
+
+# There are two separate checks for each of the exact-width integer types we
+# need.  First we check whether the type is available using the usual
+# AC_CHECK_TYPE macro with the default includes (which includes <inttypes.h>
+# and <stdint.h> where available).  We then also use the special type checks of
+# the form AC_TYPE_UINT32_T, which in the case that uint32_t is not available
+# directly, #define's uint32_t to be a suitable type.
+
+ac_fn_c_check_type "$LINENO" "uint32_t" "ac_cv_type_uint32_t" "$ac_includes_default"
+if test "x$ac_cv_type_uint32_t" = xyes; then :
+
+$as_echo "#define HAVE_UINT32_T 1" >>confdefs.h
+
+fi
+
 ac_fn_c_find_uintX_t "$LINENO" "32" "ac_cv_c_uint32_t"
 case $ac_cv_c_uint32_t in #(
   no|yes) ;; #(
@@ -6717,6 +6732,14 @@
 ;;
   esac
 
+
+ac_fn_c_check_type "$LINENO" "uint64_t" "ac_cv_type_uint64_t" "$ac_includes_default"
+if test "x$ac_cv_type_uint64_t" = xyes; then :
+
+$as_echo "#define HAVE_UINT64_T 1" >>confdefs.h
+
+fi
+
 ac_fn_c_find_uintX_t "$LINENO" "64" "ac_cv_c_uint64_t"
 case $ac_cv_c_uint64_t in #(
   no|yes) ;; #(
@@ -6731,6 +6754,14 @@
 ;;
   esac
 
+
+ac_fn_c_check_type "$LINENO" "int32_t" "ac_cv_type_int32_t" "$ac_includes_default"
+if test "x$ac_cv_type_int32_t" = xyes; then :
+
+$as_echo "#define HAVE_INT32_T 1" >>confdefs.h
+
+fi
+
 ac_fn_c_find_intX_t "$LINENO" "32" "ac_cv_c_int32_t"
 case $ac_cv_c_int32_t in #(
   no|yes) ;; #(
@@ -6742,6 +6773,14 @@
 ;;
 esac
 
+
+ac_fn_c_check_type "$LINENO" "int64_t" "ac_cv_type_int64_t" "$ac_includes_default"
+if test "x$ac_cv_type_int64_t" = xyes; then :
+
+$as_echo "#define HAVE_INT64_T 1" >>confdefs.h
+
+fi
+
 ac_fn_c_find_intX_t "$LINENO" "64" "ac_cv_c_int64_t"
 case $ac_cv_c_int64_t in #(
   no|yes) ;; #(
@@ -6753,6 +6792,7 @@
 ;;
 esac
 
+
 ac_fn_c_check_type "$LINENO" "ssize_t" "ac_cv_type_ssize_t" "$ac_includes_default"
 if test "x$ac_cv_type_ssize_t" = xyes; then :
 
diff --git a/configure.ac b/configure.ac
index 09275b2..7f12536 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1517,10 +1517,30 @@
 AC_DEFINE_UNQUOTED([RETSIGTYPE],[void],[assume C89 semantics that RETSIGTYPE is always void])
 AC_TYPE_SIZE_T
 AC_TYPE_UID_T
+
+# There are two separate checks for each of the exact-width integer types we
+# need.  First we check whether the type is available using the usual
+# AC_CHECK_TYPE macro with the default includes (which includes <inttypes.h>
+# and <stdint.h> where available).  We then also use the special type checks of
+# the form AC_TYPE_UINT32_T, which in the case that uint32_t is not available
+# directly, #define's uint32_t to be a suitable type.
+
+AC_CHECK_TYPE(uint32_t,
+  AC_DEFINE(HAVE_UINT32_T, 1, [Define if your compiler provides uint32_t.]),,)
 AC_TYPE_UINT32_T
+
+AC_CHECK_TYPE(uint64_t,
+  AC_DEFINE(HAVE_UINT64_T, 1, [Define if your compiler provides uint64_t.]),,)
 AC_TYPE_UINT64_T
+
+AC_CHECK_TYPE(int32_t,
+  AC_DEFINE(HAVE_INT32_T, 1, [Define if your compiler provides int32_t.]),,)
 AC_TYPE_INT32_T
+
+AC_CHECK_TYPE(int64_t,
+  AC_DEFINE(HAVE_INT64_T, 1, [Define if your compiler provides int64_t.]),,)
 AC_TYPE_INT64_T
+
 AC_CHECK_TYPE(ssize_t,
   AC_DEFINE(HAVE_SSIZE_T, 1, [Define if your compiler provides ssize_t]),,)
 
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 9c8801d..7703992 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -370,6 +370,12 @@
 /* Define to 1 if you have the `initgroups' function. */
 #undef HAVE_INITGROUPS
 
+/* Define if your compiler provides int32_t. */
+#undef HAVE_INT32_T
+
+/* Define if your compiler provides int64_t. */
+#undef HAVE_INT64_T
+
 /* Define to 1 if you have the <inttypes.h> header file. */
 #undef HAVE_INTTYPES_H
 
@@ -847,6 +853,12 @@
 /* Define this if you have tcl and TCL_UTF_MAX==6 */
 #undef HAVE_UCS4_TCL
 
+/* Define if your compiler provides uint32_t. */
+#undef HAVE_UINT32_T
+
+/* Define if your compiler provides uint64_t. */
+#undef HAVE_UINT64_T
+
 /* Define to 1 if the system has the type `uintptr_t'. */
 #undef HAVE_UINTPTR_T