From 604d95e235d86465b8c17f02095edcaf18464d4c Mon Sep 17 00:00:00 2001
From: Lawrence D'Anna <64555057+lawrence-danna-apple@users.noreply.github.com>
Date: Tue, 30 Jun 2020 02:15:46 -0700
Subject: bpo-41100: fix _decimal for arm64 Mac OS (GH-21228)

Patch by Lawrence Danna.
---
 .../next/Core and Builtins/2020-06-30-04-44-29.bpo-41100.PJwA6F.rst    | 1 +
 Modules/_decimal/libmpdec/mpdecimal.h                                  | 3 +++
 2 files changed, 4 insertions(+)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2020-06-30-04-44-29.bpo-41100.PJwA6F.rst

diff --git a/Misc/NEWS.d/next/Core and Builtins/2020-06-30-04-44-29.bpo-41100.PJwA6F.rst b/Misc/NEWS.d/next/Core and Builtins/2020-06-30-04-44-29.bpo-41100.PJwA6F.rst
new file mode 100644
index 0000000..d6176d6
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2020-06-30-04-44-29.bpo-41100.PJwA6F.rst	
@@ -0,0 +1 @@
+add arm64 to the allowable Mac OS arches in mpdecimal.h
\ No newline at end of file
diff --git a/Modules/_decimal/libmpdec/mpdecimal.h b/Modules/_decimal/libmpdec/mpdecimal.h
index 108b76e..35ce429 100644
--- a/Modules/_decimal/libmpdec/mpdecimal.h
+++ b/Modules/_decimal/libmpdec/mpdecimal.h
@@ -127,6 +127,9 @@ const char *mpd_version(void);
   #elif defined(__x86_64__)
     #define CONFIG_64
     #define ASM
+  #elif defined(__arm64__)
+    #define CONFIG_64
+    #define ANSI
   #else
     #error "unknown architecture for universal build."
   #endif
-- 
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