--- /dev/null
+based from gentoo
+http://bugs.gentoo.org/show_bug.cgi?id=94664
+
+--- ./configure.orig 2005-05-05 08:15:43.000000000 +0100
++++ ./configure 2005-05-31 23:32:26.000000000 +0100
+@@ -9,6 +9,7 @@
+ x86_cpus="i386,i486,i586,i686,pentium,pentiumpro,${x86_mmx_cpus}"
+ x86_cmov_cpus="i686,pentiumpro,pentium2,pentium3,pentium3m,pentium-m,pentium4,"
+ x86_cmov_cpus="pentium4m,prescott,athlon,athlon-xp,c3-2"
++x86_64_cpus="x86-64,athlon64,k8,opteron,athlon-fx"
+
+ # default parameters
+ compile_type="release"
+@@ -223,6 +224,14 @@
+ cpu="x86"
+ fi
+
++is_x86_64_cpu() {
++ expr ",${x86_64_cpus}," : ".*,$1," > /dev/null
++}
++
++if is_x86_64_cpu "$cpu" ; then
++ cpu="x86_64"
++fi
++
+ case "$cpu" in
+ x86)
+ ;;