diff -urN fetchmail-6.2.5/config.sub fetchmail-6.2.5.new/config.sub
--- fetchmail-6.2.5/config.sub	2003-07-17 03:03:20.000000000 +0200
+++ fetchmail-6.2.5.new/config.sub	2006-03-30 00:36:11.000000000 +0200
@@ -176,7 +176,7 @@
 		| 580 | i960 | h8300 \
 		| x86 | ppcbe | mipsbe | mipsle | shbe | shle | armbe | armle \
 		| hppa | hppa1.0 | hppa1.1 | hppa2.0 | hppa2.0w | hppa2.0n \
-		| hppa64 \
+		| hppa64 | x86_64 \
 		| alpha | alphaev[4-8] | alphaev56 | alphapca5[67] \
 		| alphaev6[78] \
 		| we32k | ns16k | clipper | i370 | sh | powerpc | powerpcle \
@@ -194,7 +194,7 @@
 	# We use `pc' rather than `unknown'
 	# because (1) that's what they normally are, and
 	# (2) the word "unknown" tends to confuse beginning users.
-	i[34567]86)
+	i*86 | x86_64)
 	  basic_machine=$basic_machine-pc
 	  ;;
 	# Object if more than one company name word.
@@ -209,7 +209,7 @@
 	      | mips-* | pyramid-* | tron-* | a29k-* | romp-* | rs6000-* \
 	      | power-* | none-* | 580-* | cray2-* | h8300-* | h8500-* | i960-* \
 	      | xmp-* | ymp-* \
-	      | x86-* | ppcbe-* | mipsbe-* | mipsle-* | shbe-* | shle-* | armbe-* | armle-* \
+	      | x86-* | x86_64-* | ppcbe-* | mipsbe-* | mipsle-* | shbe-* | shle-* | armbe-* | armle-* \
 	      | hppa-* | hppa1.0-* | hppa1.1-* | hppa2.0-* | hppa2.0w-* \
 	      | hppa2.0n-* | hppa64-* \
 	      | alpha-* | alphaev[4-8]-* | alphaev56-* | alphapca5[67]-* \
@@ -256,6 +256,12 @@
 		basic_machine=a29k-none
 		os=-bsd
 		;;
+	amd64)
+		basic_machine=x86_64-pc
+		;;
+	amd64-*)
+		basic_machine=x86_64-`echo $basic_machine | sed 's/^[^-]*-//'`
+		;;
 	amdahl)
 		basic_machine=580-amdahl
 		os=-sysv
