--- build/moz.configure/init.configure.orig	2022-03-30 19:25:29 UTC
+++ build/moz.configure/init.configure
@@ -729,6 +729,9 @@ def split_triplet(triplet, allow_msvc=False, allow_was
     elif cpu in ("x86_64", "ia64"):
         canonical_cpu = cpu
         endianness = "little"
+    elif cpu in ("amd64"):
+        canonical_cpu = "x86_64"
+        endianness = "little"
     elif cpu in ("s390", "s390x"):
         canonical_cpu = cpu
         endianness = "big"