diff -urN flex-2.5.36/config.guess flex-2.5.36-aarch64/config.guess

--- flex-2.5.36/config.guess	2012-06-22 16:02:51.000000000 -0500

+++ flex-2.5.36-aarch64/config.guess	2013-03-03 04:41:12.069186825 -0600

@@ -854,6 +868,13 @@

     i*86:Minix:*:*)

 	echo ${UNAME_MACHINE}-pc-minix

 	exit ;;

+    aarch64:Linux:*:*)

+	echo ${UNAME_MACHINE}-unknown-linux-gnu

+	exit ;;

+    aarch64_be:Linux:*:*)

+	UNAME_MACHINE=aarch64_be

+	echo ${UNAME_MACHINE}-unknown-linux-gnu

+	exit ;;

     arm*:Linux:*:*)

 	eval $set_cc_for_build

 	if echo __ARM_EABI__ | $CC_FOR_BUILD -E - 2>/dev/null \

diff -urN flex-2.5.36/config.sub flex-2.5.36-aarch64/config.sub

--- flex-2.5.36/config.sub	2012-06-22 16:02:51.000000000 -0500

+++ flex-2.5.36-aarch64/config.sub	2013-03-03 04:41:12.105182658 -0600

@@ -242,6 +255,7 @@

 	# Some are omitted here because they have special meanings below.

 	1750a | 580 \

 	| a29k \

+	| aarch64 | aarch64_be \

 	| alpha | alphaev[4-8] | alphaev56 | alphaev6[78] | alphapca5[67] \

 	| alpha64 | alpha64ev[4-8] | alpha64ev56 | alpha64ev6[78] | alpha64pca5[67] \

 	| am33_2.0 \

@@ -322,6 +367,7 @@

 	# Recognize the basic CPU types with company name.

 	580-* \

 	| a29k-* \

+	| aarch64-* | aarch64_be-* \

 	| alpha-* | alphaev[4-8]-* | alphaev56-* | alphaev6[78]-* \

 	| alpha64-* | alpha64ev[4-8]-* | alpha64ev56-* | alpha64ev6[78]-* \

 	| alphapca5[67]-* | alpha64pca5[67]-* | arc-* \