--- libast-0.6.1.ebuild.orig	2005-03-08 14:57:30.000000000 +0100
+++ libast-0.6.1.ebuild	2005-03-08 15:21:49.000000000 +0100
@@ -20,10 +20,17 @@
 
 src_compile() {
 	local myregexp="posix"
+	local mymmx=""
 	use pcre && myregexp="pcre"
+	if use amd64; then
+		mymmx="--enable-mmx"
+	else
+		mymmx=`use_enable mmx`
+	fi
+
 	econf \
 		$(use_with imlib) \
-		$(use_enable mmx) \
+		${mymmx} \
 		--with-regexp=${myregexp} \
 		|| die
 	emake || die