--- configure.ac	2009-01-19 18:15:44.000000000 -0500
+++ configure.ac	2009-01-19 18:16:11.000000000 -0500
@@ -50,7 +50,7 @@
                 ARCH_SPECIFIC_CFLAGS=""
                 ARCH_STRING="X86"
                 ;;
-        x86_64-*)
+        x86_64-* | amd64-* )
                 AC_DEFINE(ARCH_X86_64, 1, [Architecture is x86-64])
                 ARCH_SPECIFIC_CFLAGS="-DUSE_ADDR64"
                 ARCH_STRING="X86-64"