arrow with pypy3

gistfile1.txt

diff --git a/cpp/src/arrow/python/datetime.cc b/cpp/src/arrow/python/datetime.cc
index 4eeab7f5a..9a7624ef7 100644
--- a/cpp/src/arrow/python/datetime.cc
+++ b/cpp/src/arrow/python/datetime.cc
@@ -74,6 +74,7 @@ bool MatchFixedOffset(const std::string& tz, util::string_view* sign,
 
 }  // namespace
 
+#ifndef PYPY_VERSION
 PyDateTime_CAPI* datetime_api = nullptr;
 
 void InitDatetime() {
@@ -84,6 +85,7 @@ void InitDatetime() {
     Py_FatalError("Could not import datetime C API");
   }
 }
+#endif
 
 // The following code is adapted from
 // https://github.com/numpy/numpy/blob/master/numpy/core/src/multiarray/datetime.c
diff --git a/cpp/src/arrow/python/datetime.h b/cpp/src/arrow/python/datetime.h
index 4f3adb4cd..5038d6925 100644
--- a/cpp/src/arrow/python/datetime.h
+++ b/cpp/src/arrow/python/datetime.h
@@ -31,16 +31,22 @@
 // C datetime API.  This is error-prone and potentially costly.
 // Instead, we redefine PyDateTimeAPI to point to a global variable,
 // which is initialized once by calling InitDatetime().
+#ifdef PYPY_VERSION
+#include "datetime.h"
+#else
 #define PyDateTimeAPI ::arrow::py::internal::datetime_api
+#endif
 
 namespace arrow {
 namespace py {
 namespace internal {
 
+#ifndef PYPY_VERSION
 extern PyDateTime_CAPI* datetime_api;
 
 ARROW_PYTHON_EXPORT
 void InitDatetime();
+#endif
 
 ARROW_PYTHON_EXPORT
 inline int64_t PyTime_to_us(PyObject* pytime) {
diff --git a/cpp/src/arrow/python/pyarrow.cc b/cpp/src/arrow/python/pyarrow.cc
index 12883f547..a6b8490e0 100644
--- a/cpp/src/arrow/python/pyarrow.cc
+++ b/cpp/src/arrow/python/pyarrow.cc
@@ -40,7 +40,11 @@ static Status UnwrapError(PyObject* obj, const char* expected_type) {
 }
 
 int import_pyarrow() {
+#ifdef PYPY_VERSION
+PyDateTime_IMPORT;
+#else
   internal::InitDatetime();
+#endif
   return ::import_pyarrow__lib();
 }