-*- Mode: diff -*-
--- configure
+++ configure
@@ -3374,7 +3374,7 @@
   # has no effect, don't bother defining them
   Darwin/[6789].*)
     define_xopen_source=no;;
-  Darwin/1[0-9].*)
+  Darwin/[12][0-9].*)
     define_xopen_source=no;;
   # On AIX 4 and 5.1, mbstate_t is defined only when _XOPEN_SOURCE == 500 but
   # used in wcsnrtombs() and mbsnrtowcs() even if _XOPEN_SOURCE is not defined
@@ -9372,6 +9275,9 @@
     	esac
     else
     	case `/usr/bin/arch` in
+     	arm64)
+    		MACOSX_DEFAULT_ARCH="arm64"
+     		;;
     	i386)
     		MACOSX_DEFAULT_ARCH="x86_64"
     		;;
--- Mac/Tools/pythonw.c
+++ Mac/Tools/pythonw.c
@@ -121,6 +121,8 @@
     cpu_types[0] = CPU_TYPE_POWERPC;
 #elif defined(__i386__)
     cpu_types[0] = CPU_TYPE_X86;
+#elif defined(__arm64__)
+    cpu_types[0] = CPU_TYPE_ARM64;
 #else
 #       error "Unknown CPU"
 #endif
--- setup.py
+++ setup.py
@@ -670,7 +670,10 @@
             add_dir_to_list(self.compiler.include_dirs,
                             sysconfig.get_config_var("INCLUDEDIR"))
 
-        system_lib_dirs = ['/lib64', '/usr/lib64', '/lib', '/usr/lib']
+        if host_platform == 'darwin':
+            system_lib_dirs = ['/usr/lib', macosx_sdk_root()+'/usr/lib']
+        else:
+            system_lib_dirs = ['/lib64', '/usr/lib64', '/lib', '/usr/lib']
         system_include_dirs = ['/usr/include']
         # lib_dirs and inc_dirs are used to search for files;
         # if a file is found in one of those directories, it can
--- Modules/_decimal/libmpdec/mpdecimal.h
+++ Modules/_decimal/libmpdec/mpdecimal.h
@@ -135,6 +135,9 @@
   #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