--- libserial-9999.ebuild.orig	2010-01-14 18:50:11.000000000 +0100
+++ libserial-9999.ebuild	2010-01-14 18:52:21.000000000 +0100
@@ -19,7 +19,8 @@
 
 src_unpack() {
 	subversion_src_unpack
-	eautoreconf || die "eautoconf failed"
+	cd ${S} && mkdir -pv "m4"
+	eautoreconf || die "eautoreconf failed"
 }
 
 src_compile(){