diff --git a/Include/internal/pycore_ceval.h b/Include/internal/pycore_ceval.h
index 7a3166e..37170ed 100644
--- a/Include/internal/pycore_ceval.h
+++ b/Include/internal/pycore_ceval.h
@@ -19,6 +19,7 @@
 PyAPI_FUNC(void) _PyEval_SignalReceived(
     struct _ceval_runtime_state *ceval);
 PyAPI_FUNC(int) _PyEval_AddPendingCall(
+    PyThreadState *tstate,
     struct _ceval_runtime_state *ceval,
     int (*func)(void *),
     void *arg);
diff --git a/Include/internal/pycore_pyerrors.h b/Include/internal/pycore_pyerrors.h
new file mode 100644
index 0000000..23327ef
--- /dev/null
+++ b/Include/internal/pycore_pyerrors.h
@@ -0,0 +1,62 @@
+#ifndef Py_INTERNAL_PYERRORS_H
+#define Py_INTERNAL_PYERRORS_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifndef Py_BUILD_CORE
+#  error "this header requires Py_BUILD_CORE define"
+#endif
+
+static inline PyObject* _PyErr_Occurred(PyThreadState *tstate)
+{
+    return tstate == NULL ? NULL : tstate->curexc_type;
+}
+
+
+PyAPI_FUNC(void) _PyErr_Fetch(
+    PyThreadState *tstate,
+    PyObject **type,
+    PyObject **value,
+    PyObject **traceback);
+
+PyAPI_FUNC(int) _PyErr_ExceptionMatches(
+    PyThreadState *tstate,
+    PyObject *exc);
+
+PyAPI_FUNC(void) _PyErr_Restore(
+    PyThreadState *tstate,
+    PyObject *type,
+    PyObject *value,
+    PyObject *traceback);
+
+PyAPI_FUNC(void) _PyErr_SetObject(
+    PyThreadState *tstate,
+    PyObject *type,
+    PyObject *value);
+
+PyAPI_FUNC(void) _PyErr_Clear(PyThreadState *tstate);
+
+PyAPI_FUNC(void) _PyErr_SetNone(PyThreadState *tstate, PyObject *exception);
+
+PyAPI_FUNC(void) _PyErr_SetString(
+    PyThreadState *tstate,
+    PyObject *exception,
+    const char *string);
+
+PyAPI_FUNC(PyObject *) _PyErr_Format(
+    PyThreadState *tstate,
+    PyObject *exception,
+    const char *format,
+    ...);
+
+PyAPI_FUNC(void) _PyErr_NormalizeException(
+    PyThreadState *tstate,
+    PyObject **exc,
+    PyObject **val,
+    PyObject **tb);
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !Py_INTERNAL_PYERRORS_H */
diff --git a/Include/internal/pycore_pylifecycle.h b/Include/internal/pycore_pylifecycle.h
index 07cf815..13a31c2 100644
--- a/Include/internal/pycore_pylifecycle.h
+++ b/Include/internal/pycore_pylifecycle.h
@@ -106,6 +106,8 @@
 
 PyAPI_FUNC(PyObject*) _PyErr_WriteUnraisableDefaultHook(PyObject *unraisable);
 
+PyAPI_FUNC(void) _PyErr_Print(PyThreadState *tstate);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/Include/internal/pycore_pymem.h b/Include/internal/pycore_pymem.h
index dcc492a..22677d3 100644
--- a/Include/internal/pycore_pymem.h
+++ b/Include/internal/pycore_pymem.h
@@ -1,5 +1,5 @@
-#ifndef Py_INTERNAL_MEM_H
-#define Py_INTERNAL_MEM_H
+#ifndef Py_INTERNAL_PYMEM_H
+#define Py_INTERNAL_PYMEM_H
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -191,4 +191,4 @@
 #ifdef __cplusplus
 }
 #endif
-#endif /* !Py_INTERNAL_MEM_H */
+#endif /* !Py_INTERNAL_PYMEM_H */