--- nullmailer-1.13.ebuild
+++ nullmailer-1.13.ebuild
@@ -57,6 +57,7 @@
 	sed -i.orig \
 		-e '/^nullmailer_send_LDADD/s, =, = ../lib/cli++/libcli++.a,' \
 		"${S}"/src/Makefile.am || die "Sed failed"
+	sed -e "s/AM_CONFIG_HEADER/AC_CONFIG_HEADERS/" -i configure.in
 	eautoreconf
 }