diff --git a/Include/abstract.h b/Include/abstract.h
index 6d40ef7..d2e9682 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -1232,6 +1232,9 @@
 
 PyAPI_FUNC(int) _PyObject_RealIsSubclass(PyObject *derived, PyObject *cls);
 
+PyAPI_FUNC(char *const *) _PySequence_BytesToCharpArray(PyObject* self);
+
+PyAPI_FUNC(void) _Py_FreeCharPArray(char *const array[]);
 
 #ifdef __cplusplus
 }
diff --git a/Include/longobject.h b/Include/longobject.h
index 83d780d..4dc2e18 100644
--- a/Include/longobject.h
+++ b/Include/longobject.h
@@ -41,6 +41,23 @@
 #define PyLong_AsSocket_t(fd) (SOCKET_T)PyLong_AsLongLong(fd)
 #endif
 
+/* Issue #1983: pid_t can be longer than a C long on some systems */
+#if !defined(SIZEOF_PID_T) || SIZEOF_PID_T == SIZEOF_INT
+#define PARSE_PID "i"
+#define PyLong_FromPid PyLong_FromLong
+#define PyLong_AsPid PyLong_AsLong
+#elif SIZEOF_PID_T == SIZEOF_LONG
+#define PARSE_PID "l"
+#define PyLong_FromPid PyLong_FromLong
+#define PyLong_AsPid PyLong_AsLong
+#elif defined(SIZEOF_LONG_LONG) && SIZEOF_PID_T == SIZEOF_LONG_LONG
+#define PARSE_PID "L"
+#define PyLong_FromPid PyLong_FromLongLong
+#define PyLong_AsPid PyLong_AsLongLong
+#else
+#error "sizeof(pid_t) is neither sizeof(int), sizeof(long) or sizeof(long long)"
+#endif /* SIZEOF_PID_T */
+
 /* For use by intobject.c only */
 PyAPI_DATA(unsigned char) _PyLong_DigitValue[256];
 
diff --git a/Include/pythonrun.h b/Include/pythonrun.h
index 09d3ee5..b49ad96 100644
--- a/Include/pythonrun.h
+++ b/Include/pythonrun.h
@@ -81,6 +81,9 @@
 
 PyAPI_FUNC(void) Py_Exit(int);
 
+/* Restore signals that the interpreter has called SIG_IGN on to SIG_DFL. */
+PyAPI_FUNC(void) _Py_RestoreSignals(void);
+
 PyAPI_FUNC(int) Py_FdIsInteractive(FILE *, const char *);
 
 /* Bootstrap */