--- wscript.orig	2020-07-08 18:34:29 UTC

+++ wscript

@@ -502,7 +502,7 @@ int main() { return 0; }''',

         c_flags.append("-Qunused-arguments")

         cxx_flags.append("-Qunused-arguments")

-    if (re.search ("(i[0-9]86|x86_64|AMD64)", cpu) != None) and conf.env['build_target'] != 'none':

+    if (re.search ("(i[0-9]86|x86_64|amd64|AMD64)", cpu) != None) and conf.env['build_target'] != 'none':

         #

         # ARCH_X86 means anything in the x86 family from i386 to x86_64

@@ -534,6 +534,13 @@ int main() { return 0; }''',

                 compiler_flags.append ("-march=i586")

             elif cpu == "i686":

                 compiler_flags.append ("-march=i686")

+

+        else :

+            # and cpu == 'amd64' :

+            # this is 20yo tech and present in all 64bit cpus

+            build_host_supports_sse = True

+            compiler_flags.append ("-mmmx")

+            compiler_flags.append ("-m3dnow")

         if not is_clang and ((conf.env['build_target'] == 'i686') or (conf.env['build_target'] == 'x86_64')) and build_host_supports_sse:

             compiler_flags.extend ([ flags_dict['sse'], flags_dict['fpmath-sse'], flags_dict['xmmintrinsics'] ])