diff --git a/Doc/c-api/arg.rst b/Doc/c-api/arg.rst
index f9329975af5..569903f000c 100644
--- a/Doc/c-api/arg.rst
+++ b/Doc/c-api/arg.rst
@@ -265,15 +265,12 @@ Numbers
    Convert a Python integer to a C :c:type:`unsigned long` without
    overflow checking.
 
-``L`` (:class:`int`) [PY_LONG_LONG]
-   Convert a Python integer to a C :c:type:`long long`.  This format is only
-   available on platforms that support :c:type:`long long` (or :c:type:`_int64` on
-   Windows).
+``L`` (:class:`int`) [long long]
+   Convert a Python integer to a C :c:type:`long long`.
 
-``K`` (:class:`int`) [unsigned PY_LONG_LONG]
+``K`` (:class:`int`) [unsigned long long]
    Convert a Python integer to a C :c:type:`unsigned long long`
-   without overflow checking.  This format is only available on platforms that
-   support :c:type:`unsigned long long` (or :c:type:`unsigned _int64` on Windows).
+   without overflow checking.
 
 ``n`` (:class:`int`) [Py_ssize_t]
    Convert a Python integer to a C :c:type:`Py_ssize_t`.
@@ -594,15 +591,11 @@ Building values
    ``k`` (:class:`int`) [unsigned long]
       Convert a C :c:type:`unsigned long` to a Python integer object.
 
-   ``L`` (:class:`int`) [PY_LONG_LONG]
-      Convert a C :c:type:`long long` to a Python integer object. Only available
-      on platforms that support :c:type:`long long` (or :c:type:`_int64` on
-      Windows).
+   ``L`` (:class:`int`) [long long]
+      Convert a C :c:type:`long long` to a Python integer object.
 
-   ``K`` (:class:`int`) [unsigned PY_LONG_LONG]
-      Convert a C :c:type:`unsigned long long` to a Python integer object. Only
-      available on platforms that support :c:type:`unsigned long long` (or
-      :c:type:`unsigned _int64` on Windows).
+   ``K`` (:class:`int`) [unsigned long long]
+      Convert a C :c:type:`unsigned long long` to a Python integer object.
 
    ``n`` (:class:`int`) [Py_ssize_t]
       Convert a C :c:type:`Py_ssize_t` to a Python integer.
diff --git a/Doc/c-api/long.rst b/Doc/c-api/long.rst
index b3480159c03..bae9703590b 100644
--- a/Doc/c-api/long.rst
+++ b/Doc/c-api/long.rst
@@ -62,13 +62,13 @@ All integers are implemented as "long" integer objects of arbitrary size.
    *NULL* on failure.
 
 
-.. c:function:: PyObject* PyLong_FromLongLong(PY_LONG_LONG v)
+.. c:function:: PyObject* PyLong_FromLongLong(long long v)
 
    Return a new :c:type:`PyLongObject` object from a C :c:type:`long long`, or *NULL*
    on failure.
 
 
-.. c:function:: PyObject* PyLong_FromUnsignedLongLong(unsigned PY_LONG_LONG v)
+.. c:function:: PyObject* PyLong_FromUnsignedLongLong(unsigned long long v)
 
    Return a new :c:type:`PyLongObject` object from a C :c:type:`unsigned long long`,
    or *NULL* on failure.
@@ -148,7 +148,7 @@ All integers are implemented as "long" integer objects of arbitrary size.
    occurs set *\*overflow* to ``0`` and return ``-1`` as usual.
 
 
-.. c:function:: PY_LONG_LONG PyLong_AsLongLong(PyObject *obj)
+.. c:function:: long long PyLong_AsLongLong(PyObject *obj)
 
    .. index::
       single: OverflowError (built-in exception)
@@ -161,7 +161,7 @@ All integers are implemented as "long" integer objects of arbitrary size.
    :c:type:`long`.
 
 
-.. c:function:: PY_LONG_LONG PyLong_AsLongLongAndOverflow(PyObject *obj, int *overflow)
+.. c:function:: long long PyLong_AsLongLongAndOverflow(PyObject *obj, int *overflow)
 
    Return a C :c:type:`long long` representation of *obj*.  If *obj* is not an
    instance of :c:type:`PyLongObject`, first call its :meth:`__int__` method
@@ -210,16 +210,16 @@ All integers are implemented as "long" integer objects of arbitrary size.
    :c:type:`size_t`.
 
 
-.. c:function:: unsigned PY_LONG_LONG PyLong_AsUnsignedLongLong(PyObject *pylong)
+.. c:function:: unsigned long long PyLong_AsUnsignedLongLong(PyObject *pylong)
 
    .. index::
       single: OverflowError (built-in exception)
 
-   Return a C :c:type:`unsigned PY_LONG_LONG` representation of *pylong*.
-   *pylong* must be an instance of :c:type:`PyLongObject`.
+   Return a C :c:type:`unsigned long long` representation of *pylong*.  *pylong*
+   must be an instance of :c:type:`PyLongObject`.
 
    Raise :exc:`OverflowError` if the value of *pylong* is out of range for an
-   :c:type:`unsigned PY_LONG_LONG`.
+   :c:type:`unsigned long long`.
 
    .. versionchanged:: 3.1
       A negative *pylong* now raises :exc:`OverflowError`, not :exc:`TypeError`.
@@ -235,7 +235,7 @@ All integers are implemented as "long" integer objects of arbitrary size.
    return the reduction of that value modulo :const:`ULONG_MAX + 1`.
 
 
-.. c:function:: unsigned PY_LONG_LONG PyLong_AsUnsignedLongLongMask(PyObject *obj)
+.. c:function:: unsigned long long PyLong_AsUnsignedLongLongMask(PyObject *obj)
 
    Return a C :c:type:`unsigned long long` representation of *obj*.  If *obj*
    is not an instance of :c:type:`PyLongObject`, first call its :meth:`__int__`
diff --git a/Doc/c-api/unicode.rst b/Doc/c-api/unicode.rst
index 55ef5750f51..44e92593c12 100644
--- a/Doc/c-api/unicode.rst
+++ b/Doc/c-api/unicode.rst
@@ -440,7 +440,6 @@ APIs:
    .. % because not all compilers support the %z width modifier -- we fake it
    .. % when necessary via interpolating PY_FORMAT_SIZE_T.
    .. % Similar comments apply to the %ll width modifier and
-   .. % PY_FORMAT_LONG_LONG.
 
    .. tabularcolumns:: |l|l|L|
 
diff --git a/Include/pyport.h b/Include/pyport.h
index 94c135ff610..b631cf3c980 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -39,27 +39,10 @@ Used in:  Py_SAFE_DOWNCAST
 
 #ifndef PY_LONG_LONG
 #define PY_LONG_LONG long long
-#if defined(LLONG_MAX)
 /* If LLONG_MAX is defined in limits.h, use that. */
 #define PY_LLONG_MIN LLONG_MIN
 #define PY_LLONG_MAX LLONG_MAX
 #define PY_ULLONG_MAX ULLONG_MAX
-#elif defined(__LONG_LONG_MAX__)
-/* Otherwise, if GCC has a builtin define, use that.  (Definition of
- * PY_LLONG_MIN assumes two's complement with no trap representation.) */
-#define PY_LLONG_MAX __LONG_LONG_MAX__
-#define PY_LLONG_MIN (-PY_LLONG_MAX - 1)
-#define PY_ULLONG_MAX (PY_LLONG_MAX * Py_ULL(2) + 1)
-#elif defined(SIZEOF_LONG_LONG)
-/* Otherwise compute from SIZEOF_LONG_LONG, assuming two's complement, no
-   padding bits, and no trap representation.  Note: PY_ULLONG_MAX was
-   previously #defined as (~0ULL) here; but that'll give the wrong value in a
-   preprocessor expression on systems where long long != intmax_t. */
-#define PY_LLONG_MAX                                                    \
-    (1 + 2 * ((Py_LL(1) << (CHAR_BIT * SIZEOF_LONG_LONG - 2)) - 1))
-#define PY_LLONG_MIN (-PY_LLONG_MAX - 1)
-#define PY_ULLONG_MAX (PY_LLONG_MAX * Py_ULL(2) + 1)
-#endif /* LLONG_MAX */
 #endif
 
 #define PY_UINT32_T uint32_t
@@ -159,19 +142,6 @@ typedef int Py_ssize_clean_t;
 #   endif
 #endif
 
-/* PY_FORMAT_LONG_LONG is analogous to PY_FORMAT_SIZE_T above, but for
- * the long long type instead of the size_t type. The "high level" Python format
- * functions listed above will interpret "lld" or "llu" correctly on
- * all platforms.
- */
-#ifndef PY_FORMAT_LONG_LONG
-#    ifdef MS_WINDOWS
-#       define PY_FORMAT_LONG_LONG "I64"
-#    else
-#       error "This platform's pyconfig.h needs to define PY_FORMAT_LONG_LONG"
-#    endif
-#endif
-
 /* Py_LOCAL can be used instead of static to get the fastest possible calling
  * convention for functions that are local to a given module.
  *
diff --git a/Lib/test/test_getargs2.py b/Lib/test/test_getargs2.py
index 16e163a964a..0fbe12dd14e 100644
--- a/Lib/test/test_getargs2.py
+++ b/Lib/test/test_getargs2.py
@@ -5,10 +5,6 @@ from test import support
 # Skip this test if the _testcapi module isn't available.
 support.import_module('_testcapi')
 from _testcapi import getargs_keywords, getargs_keyword_only
-try:
-    from _testcapi import getargs_L, getargs_K
-except ImportError:
-    getargs_L = None # PY_LONG_LONG not available
 
 # > How about the following counterproposal. This also changes some of
 # > the other format codes to be a little more regular.
@@ -309,7 +305,6 @@ class Signed_TestCase(unittest.TestCase):
         self.assertRaises(OverflowError, getargs_n, VERY_LARGE)
 
 
-@unittest.skipIf(getargs_L is None, 'PY_LONG_LONG is not available')
 class LongLong_TestCase(unittest.TestCase):
     def test_L(self):
         from _testcapi import getargs_L
diff --git a/Modules/_blake2/blake2b_impl.c b/Modules/_blake2/blake2b_impl.c
index 9c3d8f54d53..58b502bb349 100644
--- a/Modules/_blake2/blake2b_impl.c
+++ b/Modules/_blake2/blake2b_impl.c
@@ -100,7 +100,7 @@ py_blake2b_new_impl(PyTypeObject *type, PyObject *data, int digest_size,
     Py_buffer buf;
 
     unsigned long leaf_size = 0;
-    unsigned PY_LONG_LONG node_offset = 0;
+    unsigned long long node_offset = 0;
 
     self = new_BLAKE2bObject(type);
     if (self == NULL) {
@@ -170,7 +170,7 @@ py_blake2b_new_impl(PyTypeObject *type, PyObject *data, int digest_size,
 
     if (node_offset_obj != NULL) {
         node_offset = PyLong_AsUnsignedLongLong(node_offset_obj);
-        if (node_offset == (unsigned PY_LONG_LONG) -1 && PyErr_Occurred()) {
+        if (node_offset == (unsigned long long) -1 && PyErr_Occurred()) {
             goto error;
         }
     }
diff --git a/Modules/_blake2/blake2s_impl.c b/Modules/_blake2/blake2s_impl.c
index 53c22c2a9bd..11d2e02251b 100644
--- a/Modules/_blake2/blake2s_impl.c
+++ b/Modules/_blake2/blake2s_impl.c
@@ -100,7 +100,7 @@ py_blake2s_new_impl(PyTypeObject *type, PyObject *data, int digest_size,
     Py_buffer buf;
 
     unsigned long leaf_size = 0;
-    unsigned PY_LONG_LONG node_offset = 0;
+    unsigned long long node_offset = 0;
 
     self = new_BLAKE2sObject(type);
     if (self == NULL) {
@@ -170,7 +170,7 @@ py_blake2s_new_impl(PyTypeObject *type, PyObject *data, int digest_size,
 
     if (node_offset_obj != NULL) {
         node_offset = PyLong_AsUnsignedLongLong(node_offset_obj);
-        if (node_offset == (unsigned PY_LONG_LONG) -1 && PyErr_Occurred()) {
+        if (node_offset == (unsigned long long) -1 && PyErr_Occurred()) {
             goto error;
         }
     }
diff --git a/Modules/_ctypes/_ctypes_test.c b/Modules/_ctypes/_ctypes_test.c
index 92c3b9e810d..629ddf66bc4 100644
--- a/Modules/_ctypes/_ctypes_test.c
+++ b/Modules/_ctypes/_ctypes_test.c
@@ -233,15 +233,15 @@ EXPORT(int) _testfunc_callback_with_pointer(int (*func)(int *))
     return (*func)(table);
 }
 
-EXPORT(PY_LONG_LONG) _testfunc_q_bhilfdq(signed char b, short h, int i, long l, float f,
-                                     double d, PY_LONG_LONG q)
+EXPORT(long long) _testfunc_q_bhilfdq(signed char b, short h, int i, long l, float f,
+                                      double d, long long q)
 {
-    return (PY_LONG_LONG)(b + h + i + l + f + d + q);
+    return (long long)(b + h + i + l + f + d + q);
 }
 
-EXPORT(PY_LONG_LONG) _testfunc_q_bhilfd(signed char b, short h, int i, long l, float f, double d)
+EXPORT(long long) _testfunc_q_bhilfd(signed char b, short h, int i, long l, float f, double d)
 {
-    return (PY_LONG_LONG)(b + h + i + l + f + d);
+    return (long long)(b + h + i + l + f + d);
 }
 
 EXPORT(int) _testfunc_callback_i_if(int value, int (*func)(int))
@@ -254,10 +254,10 @@ EXPORT(int) _testfunc_callback_i_if(int value, int (*func)(int))
     return sum;
 }
 
-EXPORT(PY_LONG_LONG) _testfunc_callback_q_qf(PY_LONG_LONG value,
-                                             PY_LONG_LONG (*func)(PY_LONG_LONG))
+EXPORT(long long) _testfunc_callback_q_qf(long long value,
+                                          long long (*func)(long long))
 {
-    PY_LONG_LONG sum = 0;
+    long long sum = 0;
 
     while (value != 0) {
         sum += func(value);
@@ -381,8 +381,8 @@ EXPORT(void) _py_func(void)
 {
 }
 
-EXPORT(PY_LONG_LONG) last_tf_arg_s;
-EXPORT(unsigned PY_LONG_LONG) last_tf_arg_u;
+EXPORT(long long) last_tf_arg_s;
+EXPORT(unsigned long long) last_tf_arg_u;
 
 struct BITS {
     int A: 1, B:2, C:3, D:4, E: 5, F: 6, G: 7, H: 8, I: 9;
@@ -445,8 +445,8 @@ static PyMethodDef module_methods[] = {
     { NULL, NULL, 0, NULL},
 };
 
-#define S last_tf_arg_s = (PY_LONG_LONG)c
-#define U last_tf_arg_u = (unsigned PY_LONG_LONG)c
+#define S last_tf_arg_s = (long long)c
+#define U last_tf_arg_u = (unsigned long long)c
 
 EXPORT(signed char) tf_b(signed char c) { S; return c/3; }
 EXPORT(unsigned char) tf_B(unsigned char c) { U; return c/3; }
@@ -456,8 +456,8 @@ EXPORT(int) tf_i(int c) { S; return c/3; }
 EXPORT(unsigned int) tf_I(unsigned int c) { U; return c/3; }
 EXPORT(long) tf_l(long c) { S; return c/3; }
 EXPORT(unsigned long) tf_L(unsigned long c) { U; return c/3; }
-EXPORT(PY_LONG_LONG) tf_q(PY_LONG_LONG c) { S; return c/3; }
-EXPORT(unsigned PY_LONG_LONG) tf_Q(unsigned PY_LONG_LONG c) { U; return c/3; }
+EXPORT(long long) tf_q(long long c) { S; return c/3; }
+EXPORT(unsigned long long) tf_Q(unsigned long long c) { U; return c/3; }
 EXPORT(float) tf_f(float c) { S; return c/3; }
 EXPORT(double) tf_d(double c) { S; return c/3; }
 EXPORT(long double) tf_D(long double c) { S; return c/3; }
@@ -471,8 +471,8 @@ EXPORT(int) __stdcall s_tf_i(int c) { S; return c/3; }
 EXPORT(unsigned int) __stdcall s_tf_I(unsigned int c) { U; return c/3; }
 EXPORT(long) __stdcall s_tf_l(long c) { S; return c/3; }
 EXPORT(unsigned long) __stdcall s_tf_L(unsigned long c) { U; return c/3; }
-EXPORT(PY_LONG_LONG) __stdcall s_tf_q(PY_LONG_LONG c) { S; return c/3; }
-EXPORT(unsigned PY_LONG_LONG) __stdcall s_tf_Q(unsigned PY_LONG_LONG c) { U; return c/3; }
+EXPORT(long long) __stdcall s_tf_q(long long c) { S; return c/3; }
+EXPORT(unsigned long long) __stdcall s_tf_Q(unsigned long long c) { U; return c/3; }
 EXPORT(float) __stdcall s_tf_f(float c) { S; return c/3; }
 EXPORT(double) __stdcall s_tf_d(double c) { S; return c/3; }
 EXPORT(long double) __stdcall s_tf_D(long double c) { S; return c/3; }
@@ -487,8 +487,8 @@ EXPORT(int) tf_bi(signed char x, int c) { S; return c/3; }
 EXPORT(unsigned int) tf_bI(signed char x, unsigned int c) { U; return c/3; }
 EXPORT(long) tf_bl(signed char x, long c) { S; return c/3; }
 EXPORT(unsigned long) tf_bL(signed char x, unsigned long c) { U; return c/3; }
-EXPORT(PY_LONG_LONG) tf_bq(signed char x, PY_LONG_LONG c) { S; return c/3; }
-EXPORT(unsigned PY_LONG_LONG) tf_bQ(signed char x, unsigned PY_LONG_LONG c) { U; return c/3; }
+EXPORT(long long) tf_bq(signed char x, long long c) { S; return c/3; }
+EXPORT(unsigned long long) tf_bQ(signed char x, unsigned long long c) { U; return c/3; }
 EXPORT(float) tf_bf(signed char x, float c) { S; return c/3; }
 EXPORT(double) tf_bd(signed char x, double c) { S; return c/3; }
 EXPORT(long double) tf_bD(signed char x, long double c) { S; return c/3; }
@@ -503,8 +503,8 @@ EXPORT(int) __stdcall s_tf_bi(signed char x, int c) { S; return c/3; }
 EXPORT(unsigned int) __stdcall s_tf_bI(signed char x, unsigned int c) { U; return c/3; }
 EXPORT(long) __stdcall s_tf_bl(signed char x, long c) { S; return c/3; }
 EXPORT(unsigned long) __stdcall s_tf_bL(signed char x, unsigned long c) { U; return c/3; }
-EXPORT(PY_LONG_LONG) __stdcall s_tf_bq(signed char x, PY_LONG_LONG c) { S; return c/3; }
-EXPORT(unsigned PY_LONG_LONG) __stdcall s_tf_bQ(signed char x, unsigned PY_LONG_LONG c) { U; return c/3; }
+EXPORT(long long) __stdcall s_tf_bq(signed char x, long long c) { S; return c/3; }
+EXPORT(unsigned long long) __stdcall s_tf_bQ(signed char x, unsigned long long c) { U; return c/3; }
 EXPORT(float) __stdcall s_tf_bf(signed char x, float c) { S; return c/3; }
 EXPORT(double) __stdcall s_tf_bd(signed char x, double c) { S; return c/3; }
 EXPORT(long double) __stdcall s_tf_bD(signed char x, long double c) { S; return c/3; }
diff --git a/Modules/_ctypes/callproc.c b/Modules/_ctypes/callproc.c
index 5fc96f7633b..d3044f3af8a 100644
--- a/Modules/_ctypes/callproc.c
+++ b/Modules/_ctypes/callproc.c
@@ -591,7 +591,7 @@ union result {
     short h;
     int i;
     long l;
-    PY_LONG_LONG q;
+    long long q;
     long double D;
     double d;
     float f;
diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
index 782336dd313..a43585f1b83 100644
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -382,9 +382,9 @@ get_ulong(PyObject *v, unsigned long *p)
 /* Same, but handling native long long. */
 
 static int
-get_longlong(PyObject *v, PY_LONG_LONG *p)
+get_longlong(PyObject *v, long long *p)
 {
-    PY_LONG_LONG x;
+    long long x;
     if (PyFloat_Check(v)) {
         PyErr_SetString(PyExc_TypeError,
                         "int expected instead of float");
@@ -400,16 +400,16 @@ get_longlong(PyObject *v, PY_LONG_LONG *p)
 /* Same, but handling native unsigned long long. */
 
 static int
-get_ulonglong(PyObject *v, unsigned PY_LONG_LONG *p)
+get_ulonglong(PyObject *v, unsigned long long *p)
 {
-    unsigned PY_LONG_LONG x;
+    unsigned long long x;
     if (PyFloat_Check(v)) {
         PyErr_SetString(PyExc_TypeError,
                         "int expected instead of float");
         return -1;
     }
     x = PyLong_AsUnsignedLongLongMask(v);
-    if (x == (unsigned PY_LONG_LONG)-1 && PyErr_Occurred())
+    if (x == (unsigned long long)-1 && PyErr_Occurred())
         return -1;
     *p = x;
     return 0;
@@ -879,12 +879,12 @@ L_get_sw(void *ptr, Py_ssize_t size)
 static PyObject *
 q_set(void *ptr, PyObject *value, Py_ssize_t size)
 {
-    PY_LONG_LONG val;
-    PY_LONG_LONG x;
+    long long val;
+    long long x;
     if (get_longlong(value, &val) < 0)
         return NULL;
     memcpy(&x, ptr, sizeof(x));
-    x = SET(PY_LONG_LONG, x, val, size);
+    x = SET(long long, x, val, size);
     memcpy(ptr, &x, sizeof(x));
     _RET(value);
 }
@@ -892,13 +892,13 @@ q_set(void *ptr, PyObject *value, Py_ssize_t size)
 static PyObject *
 q_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
 {
-    PY_LONG_LONG val;
-    PY_LONG_LONG field;
+    long long val;
+    long long field;
     if (get_longlong(value, &val) < 0)
         return NULL;
     memcpy(&field, ptr, sizeof(field));
     field = SWAP_8(field);
-    field = SET(PY_LONG_LONG, field, val, size);
+    field = SET(long long, field, val, size);
     field = SWAP_8(field);
     memcpy(ptr, &field, sizeof(field));
     _RET(value);
@@ -907,7 +907,7 @@ q_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
 static PyObject *
 q_get(void *ptr, Py_ssize_t size)
 {
-    PY_LONG_LONG val;
+    long long val;
     memcpy(&val, ptr, sizeof(val));
     GET_BITFIELD(val, size);
     return PyLong_FromLongLong(val);
@@ -916,7 +916,7 @@ q_get(void *ptr, Py_ssize_t size)
 static PyObject *
 q_get_sw(void *ptr, Py_ssize_t size)
 {
-    PY_LONG_LONG val;
+    long long val;
     memcpy(&val, ptr, sizeof(val));
     val = SWAP_8(val);
     GET_BITFIELD(val, size);
@@ -926,12 +926,12 @@ q_get_sw(void *ptr, Py_ssize_t size)
 static PyObject *
 Q_set(void *ptr, PyObject *value, Py_ssize_t size)
 {
-    unsigned PY_LONG_LONG val;
-    unsigned PY_LONG_LONG x;
+    unsigned long long val;
+    unsigned long long x;
     if (get_ulonglong(value, &val) < 0)
         return NULL;
     memcpy(&x, ptr, sizeof(x));
-    x = SET(PY_LONG_LONG, x, val, size);
+    x = SET(long long, x, val, size);
     memcpy(ptr, &x, sizeof(x));
     _RET(value);
 }
@@ -939,13 +939,13 @@ Q_set(void *ptr, PyObject *value, Py_ssize_t size)
 static PyObject *
 Q_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
 {
-    unsigned PY_LONG_LONG val;
-    unsigned PY_LONG_LONG field;
+    unsigned long long val;
+    unsigned long long field;
     if (get_ulonglong(value, &val) < 0)
         return NULL;
     memcpy(&field, ptr, sizeof(field));
     field = SWAP_8(field);
-    field = SET(unsigned PY_LONG_LONG, field, val, size);
+    field = SET(unsigned long long, field, val, size);
     field = SWAP_8(field);
     memcpy(ptr, &field, sizeof(field));
     _RET(value);
@@ -954,7 +954,7 @@ Q_set_sw(void *ptr, PyObject *value, Py_ssize_t size)
 static PyObject *
 Q_get(void *ptr, Py_ssize_t size)
 {
-    unsigned PY_LONG_LONG val;
+    unsigned long long val;
     memcpy(&val, ptr, sizeof(val));
     GET_BITFIELD(val, size);
     return PyLong_FromUnsignedLongLong(val);
@@ -963,7 +963,7 @@ Q_get(void *ptr, Py_ssize_t size)
 static PyObject *
 Q_get_sw(void *ptr, Py_ssize_t size)
 {
-    unsigned PY_LONG_LONG val;
+    unsigned long long val;
     memcpy(&val, ptr, sizeof(val));
     val = SWAP_8(val);
     GET_BITFIELD(val, size);
@@ -1477,7 +1477,7 @@ P_set(void *ptr, PyObject *value, Py_ssize_t size)
     v = (void *)PyLong_AsUnsignedLongMask(value);
 #else
 #if SIZEOF_LONG_LONG < SIZEOF_VOID_P
-#   error "PyLong_AsVoidPtr: sizeof(PY_LONG_LONG) < sizeof(void*)"
+#   error "PyLong_AsVoidPtr: sizeof(long long) < sizeof(void*)"
 #endif
     v = (void *)PyLong_AsUnsignedLongLongMask(value);
 #endif
@@ -1617,8 +1617,8 @@ typedef struct { char c; wchar_t *x; } s_wchar_p;
 #endif
 */
 
-typedef struct { char c; PY_LONG_LONG x; } s_long_long;
-#define LONG_LONG_ALIGN (sizeof(s_long_long) - sizeof(PY_LONG_LONG))
+typedef struct { char c; long long x; } s_long_long;
+#define LONG_LONG_ALIGN (sizeof(s_long_long) - sizeof(long long))
 
 /* from ffi.h:
 typedef struct _ffi_type
diff --git a/Modules/_ctypes/ctypes.h b/Modules/_ctypes/ctypes.h
index 64cb69fa2b8..b71f139f8b5 100644
--- a/Modules/_ctypes/ctypes.h
+++ b/Modules/_ctypes/ctypes.h
@@ -301,7 +301,7 @@ struct tagPyCArgObject {
         short h;
         int i;
         long l;
-        PY_LONG_LONG q;
+        long long q;
         long double D;
         double d;
         float f;
diff --git a/Modules/_io/_iomodule.h b/Modules/_io/_iomodule.h
index 007e0c4b32c..8b5ec88948e 100644
--- a/Modules/_io/_iomodule.h
+++ b/Modules/_io/_iomodule.h
@@ -85,12 +85,12 @@ extern int _PyIO_trap_eintr(void);
 #ifdef MS_WINDOWS
 
 /* Windows uses long long for offsets */
-typedef PY_LONG_LONG Py_off_t;
+typedef long long Py_off_t;
 # define PyLong_AsOff_t     PyLong_AsLongLong
 # define PyLong_FromOff_t   PyLong_FromLongLong
-# define PY_OFF_T_MAX       PY_LLONG_MAX
-# define PY_OFF_T_MIN       PY_LLONG_MIN
-# define PY_OFF_T_COMPAT    PY_LONG_LONG /* type compatible with off_t */
+# define PY_OFF_T_MAX       LLONG_MAX
+# define PY_OFF_T_MIN       LLONG_MIN
+# define PY_OFF_T_COMPAT    long long    /* type compatible with off_t */
 # define PY_PRIdOFF         "lld"        /* format to use for that type */
 
 #else
@@ -107,9 +107,9 @@ typedef off_t Py_off_t;
 #elif (SIZEOF_OFF_T == SIZEOF_LONG_LONG)
 # define PyLong_AsOff_t     PyLong_AsLongLong
 # define PyLong_FromOff_t   PyLong_FromLongLong
-# define PY_OFF_T_MAX       PY_LLONG_MAX
-# define PY_OFF_T_MIN       PY_LLONG_MIN
-# define PY_OFF_T_COMPAT    PY_LONG_LONG
+# define PY_OFF_T_MAX       LLONG_MAX
+# define PY_OFF_T_MIN       LLONG_MIN
+# define PY_OFF_T_COMPAT    long long
 # define PY_PRIdOFF         "lld"
 #elif (SIZEOF_OFF_T == SIZEOF_LONG)
 # define PyLong_AsOff_t     PyLong_AsLong
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index 96c8e7b453e..508e46e7138 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -531,7 +531,7 @@ _io_IncrementalNewlineDecoder_getstate_impl(nldecoder_object *self)
 /*[clinic end generated code: output=f0d2c9c136f4e0d0 input=f8ff101825e32e7f]*/
 {
     PyObject *buffer;
-    unsigned PY_LONG_LONG flag;
+    unsigned long long flag;
 
     if (self->decoder != Py_None) {
         PyObject *state = PyObject_CallMethodObjArgs(self->decoder,
@@ -567,7 +567,7 @@ _io_IncrementalNewlineDecoder_setstate(nldecoder_object *self,
 /*[clinic end generated code: output=c10c622508b576cb input=c53fb505a76dbbe2]*/
 {
     PyObject *buffer;
-    unsigned PY_LONG_LONG flag;
+    unsigned long long flag;
 
     if (!PyArg_ParseTuple(state, "OK", &buffer, &flag))
         return NULL;
diff --git a/Modules/_sqlite/util.c b/Modules/_sqlite/util.c
index a276dadc65f..351b1b47a44 100644
--- a/Modules/_sqlite/util.c
+++ b/Modules/_sqlite/util.c
@@ -130,7 +130,7 @@ sqlite_int64
 _pysqlite_long_as_int64(PyObject * py_val)
 {
     int overflow;
-    PY_LONG_LONG value = PyLong_AsLongLongAndOverflow(py_val, &overflow);
+    long long value = PyLong_AsLongLongAndOverflow(py_val, &overflow);
     if (value == -1 && PyErr_Occurred())
         return -1;
     if (!overflow) {
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 3553aaf4ade..88f68ef74d9 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -2680,7 +2680,7 @@ unicode_fromformat_arg(_PyUnicodeWriter *writer,
                 len = sprintf(buffer, "%lu",
                         va_arg(*vargs, unsigned long));
             else if (longlongflag)
-                len = sprintf(buffer, "%" PY_FORMAT_LONG_LONG "u",
+                len = sprintf(buffer, "%llu",
                         va_arg(*vargs, unsigned long long));
             else if (size_tflag)
                 len = sprintf(buffer, "%" PY_FORMAT_SIZE_T "u",
@@ -2697,7 +2697,7 @@ unicode_fromformat_arg(_PyUnicodeWriter *writer,
                 len = sprintf(buffer, "%li",
                         va_arg(*vargs, long));
             else if (longlongflag)
-                len = sprintf(buffer, "%" PY_FORMAT_LONG_LONG "i",
+                len = sprintf(buffer, "%lli",
                         va_arg(*vargs, long long));
             else if (size_tflag)
                 len = sprintf(buffer, "%" PY_FORMAT_SIZE_T "i",
diff --git a/aclocal.m4 b/aclocal.m4
index 9a9cc557281..2a745e57466 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -13,7 +13,7 @@
 
 m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
 dnl pkg.m4 - Macros to locate and utilise pkg-config.   -*- Autoconf -*-
-dnl serial 11 (pkg-config-0.29)
+dnl serial 11 (pkg-config-0.29.1)
 dnl
 dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
 dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
@@ -55,7 +55,7 @@ dnl
 dnl See the "Since" comment for each macro you use to see what version
 dnl of the macros you require.
 m4_defun([PKG_PREREQ],
-[m4_define([PKG_MACROS_VERSION], [0.29])
+[m4_define([PKG_MACROS_VERSION], [0.29.1])
 m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
     [m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
 ])dnl PKG_PREREQ
diff --git a/configure b/configure
index 4590423aacc..04b19686b64 100755
--- a/configure
+++ b/configure
@@ -15729,99 +15729,6 @@ $as_echo "#define HAVE_DEV_PTC 1" >>confdefs.h
 
 fi
 
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for %lld and %llu printf() format support" >&5
-$as_echo_n "checking for %lld and %llu printf() format support... " >&6; }
-if ${ac_cv_have_long_long_format+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-  if test "$cross_compiling" = yes; then :
-  ac_cv_have_long_long_format="cross -- assuming no"
-if test x$GCC = xyes; then
-save_CFLAGS=$CFLAGS
-CFLAGS="$CFLAGS -Werror -Wformat"
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-#include <stdio.h>
-#include <stddef.h>
-
-int
-main ()
-{
-
-char *buffer;
-sprintf(buffer, "%lld", (long long)123);
-sprintf(buffer, "%lld", (long long)-123);
-sprintf(buffer, "%llu", (unsigned long long)123);
-
-  ;
-  return 0;
-}
-_ACEOF
-if ac_fn_c_try_compile "$LINENO"; then :
-  ac_cv_have_long_long_format=yes
-
-fi
-rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-CFLAGS=$save_CFLAGS
-fi
-else
-  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-#include <stdio.h>
-#include <stddef.h>
-#include <string.h>
-
-#ifdef HAVE_SYS_TYPES_H
-#include <sys/types.h>
-#endif
-
-int main()
-{
-char buffer[256];
-
-if (sprintf(buffer, "%lld", (long long)123) < 0)
-return 1;
-if (strcmp(buffer, "123"))
-return 1;
-
-if (sprintf(buffer, "%lld", (long long)-123) < 0)
-return 1;
-if (strcmp(buffer, "-123"))
-return 1;
-
-if (sprintf(buffer, "%llu", (unsigned long long)123) < 0)
-return 1;
-if (strcmp(buffer, "123"))
-return 1;
-
-return 0;
-}
-
-_ACEOF
-if ac_fn_c_try_run "$LINENO"; then :
-  ac_cv_have_long_long_format=yes
-else
-  ac_cv_have_long_long_format=no
-fi
-rm -f core *.core core.conftest.* gmon.out bb.out conftest$ac_exeext \
-  conftest.$ac_objext conftest.beam conftest.$ac_ext
-fi
-
-
-fi
-
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $ac_cv_have_long_long_format" >&5
-$as_echo "$ac_cv_have_long_long_format" >&6; }
-
-if test "$ac_cv_have_long_long_format" = yes
-then
-
-$as_echo "#define PY_FORMAT_LONG_LONG \"ll\"" >>confdefs.h
-
-fi
-
 if test $ac_sys_system = Darwin
 then
 	LIBS="$LIBS -framework CoreFoundation"
diff --git a/configure.ac b/configure.ac
index c57a94e4fcc..6f3ca249794 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4938,67 +4938,6 @@ if test "x$ac_cv_file__dev_ptc" = xyes; then
   [Define to 1 if you have the /dev/ptc device file.])
 fi
 
-AC_MSG_CHECKING(for %lld and %llu printf() format support)
-AC_CACHE_VAL(ac_cv_have_long_long_format,
-AC_RUN_IFELSE([AC_LANG_SOURCE([[[
-#include <stdio.h>
-#include <stddef.h>
-#include <string.h>
-
-#ifdef HAVE_SYS_TYPES_H
-#include <sys/types.h>
-#endif
-
-int main()
-{
-char buffer[256];
-
-if (sprintf(buffer, "%lld", (long long)123) < 0)
-return 1;
-if (strcmp(buffer, "123"))
-return 1;
-
-if (sprintf(buffer, "%lld", (long long)-123) < 0)
-return 1;
-if (strcmp(buffer, "-123"))
-return 1;
-
-if (sprintf(buffer, "%llu", (unsigned long long)123) < 0)
-return 1;
-if (strcmp(buffer, "123"))
-return 1;
-
-return 0;
-}
-]]])],
-[ac_cv_have_long_long_format=yes],
-[ac_cv_have_long_long_format=no],
-[ac_cv_have_long_long_format="cross -- assuming no"
-if test x$GCC = xyes; then
-save_CFLAGS=$CFLAGS
-CFLAGS="$CFLAGS -Werror -Wformat"
-AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
-#include <stdio.h>
-#include <stddef.h>
-]], [[
-char *buffer;
-sprintf(buffer, "%lld", (long long)123);
-sprintf(buffer, "%lld", (long long)-123);
-sprintf(buffer, "%llu", (unsigned long long)123);
-]])],
-ac_cv_have_long_long_format=yes
-)
-CFLAGS=$save_CFLAGS
-fi])
-)
-AC_MSG_RESULT($ac_cv_have_long_long_format)
-
-if test "$ac_cv_have_long_long_format" = yes
-then
-  AC_DEFINE(PY_FORMAT_LONG_LONG, "ll",
-  [Define to printf format modifier for long long type])
-fi
-
 if test $ac_sys_system = Darwin
 then
 	LIBS="$LIBS -framework CoreFoundation"
diff --git a/pyconfig.h.in b/pyconfig.h.in
index 2774bf4452c..fb79413f429 100644
--- a/pyconfig.h.in
+++ b/pyconfig.h.in
@@ -1241,9 +1241,6 @@
 /* Define as the preferred size in bits of long digits */
 #undef PYLONG_BITS_IN_DIGIT
 
-/* Define to printf format modifier for long long type */
-#undef PY_FORMAT_LONG_LONG
-
 /* Define to printf format modifier for Py_ssize_t */
 #undef PY_FORMAT_SIZE_T