diff -Naur pearpc-0.5_original/configure.in pearpc-0.5_amd64/configure.in
--- pearpc-0.5_original/configure.in	2013-04-03 23:12:37.667615916 +0200
+++ pearpc-0.5_amd64/configure.in	2013-04-03 23:15:00.649608511 +0200
@@ -130,6 +130,9 @@
 jitc_x86*)
 	CPU_DIR="cpu_jitc_x86"
 ;;	
+jitc_x86_64*)
+	CPU_DIR="cpu_jitc_x86_64"
+;;	
 generic*)
 	CPU_DIR="cpu_generic"
 ;;	
@@ -146,7 +149,7 @@
 		CPU_DIR="cpu_jitc_x86"
 	fi
 ;;
-x86_64*)
+x86_64*|amd64*)
 	AC_MSG_RESULT([*** x86_64 target system])
 	ARCH_DIR=x86_64
 	if test -z "$CPU_DIR"; then