--- src/cs/c/configure.orig	2021-07-22 20:42:00 UTC
+++ src/cs/c/configure
@@ -4554,7 +4554,7 @@ if test "${enable_pthread}" = "yes" ; then
 fi
 
 case "$MACH_HOST_CPU" in
-  x86_64)
+  x86_64|amd64)
     MACH="${thread_prefix}a6${MACH_OS}"
     ;;
   x86|i*86)